Its unlikely but you should see your doctor and get the morning after pill to be certain. It can be taken up to 72hrs after sex but works more effectively the sooner its taken.

This has happened to me. You could be of course because you had sex and that will ALWAYS carry the possibility of becoming pregnant. I think your chances will be a bit higher than if the condom hadn't fallen off and seeing as even with a working condom it is only as effective as it says if you pull out before ejaculation. So there's a little bit of a chance yes. In the future please have him use a smaller condom as when this happens it usually means the condom was too big. It may be hard to suggest to him that he's too small but you really have to. You could try just buying the condoms yourself instead of having him do it and not telling him that you are buying a smaller size.

Yes. 1) The male latex condom has: - typical-use failure rate: 15% - perfect-use failure rate: 2% Source and further information: http://en.wikipedia.org/wiki/Comparison_of_birth_control_methods 2) "The effectiveness of condoms, as of most forms of contraception, can be assessed two ways. Perfect use or method effectiveness rates only include people who use condoms properly and consistently. Actual use, or typical use effectiveness rates are of all condom users, including those who use condoms improperly, inconsistently, or both. Rates are generally presented for the first year of use. Most commonly the Pearl Index is used to calculate effectiveness rates, but some studies use decrement tables. The typical use pregnancy rate among condom users varies depending on the population being studied, ranging from 10–18% per year. The perfect use pregnancy rate of condoms is 2% per year. Condoms may be combined with other forms of contraception (such as spermicide) for greater protection. Several factors account for typical use effectiveness being lower than perfect use effectiveness: mistakes on the part of those providing instructions on how to use the method mistakes on the part of the user conscious user non-compliance with instructions. For instance, someone might be given incorrect information on what lubricants are safe to use with condoms, mistakenly put the condom on improperly, or simply not bother to use a condom." "Causes of failure: Condoms may slip off the penis after ejaculation, break due to improper application or physical damage (such as tears caused when opening the package), or break or slip due to latex degradation (typically from usage past the expiration date, improper storage, or exposure to oils). The rate of breakage is between 0.4% and 2.3%, while the rate of slippage is between 0.6% and 1.3%. Even if no breakage or slippage is observed, 1–2% of women will test positive for semen residue after intercourse with a condom. "Double bagging," using two condoms at once, also increases the risk of condom failure. Different modes of condom failure result in different levels of semen exposure. If a failure occurs during application, the damaged condom may be disposed of and a new condom applied before intercourse begins - such failures generally pose no risk to the user. One study found that semen exposure from a broken condom was about half that of unprotected intercourse; semen exposure from a slipped condom was about one-fifth that of unprotected intercourse. Standard condoms will fit almost any penis, although many condom manufacturers offer "snug" or "magnum" sizes. Some manufacturers also offer custom sized-to-fit condoms, with claims that they are more reliable and offer improved sensation/comfort. Some studies have associated larger penises and smaller condoms with increased breakage and decreased slippage rates (and vice versa), but other studies have been inconclusive. Experienced condom users are significantly less likely to have a condom slip or break compared to first-time users, although users who experience one slippage or breakage are more likely to suffer a second such failure. An article in Population Reports suggests that education on condom use reduces behaviors that increase the risk of breakage and slippage. A Family Health International publication also offers the view that education can reduce the risk of breakage and slippage, but emphasizes that more research needs to be done to determine all of the causes of breakage and slippage. Among people who intend condoms to be their form of birth control, pregnancy may occur when the user has sex without a condom. The person may have run out of condoms, or be traveling and not have a condom with them, or simply dislike the feel of condoms and decide to "take a chance." This type of behavior is the primary cause of typical use failure (as opposed to method or perfect use failure). Another possible cause of condom failure is sabotage. One motive is to have a child against a partner's wishes or consent. Some commercial sex workers report clients sabotaging condoms in retaliation for being coerced into condom use. Placing pinholes in the tip of the condom is believed to significantly impact their effectiveness." Source and further information: http://en.wikipedia.org/wiki/Condom