If my last period was 11 days ago and I've recently had unprotective sex, could I be pregnant or must I be ovulation to conceve. Should I be worried?

You would have to be ovulating or just about to, in order to become pregnant. You won't become pregnant at other times of the month. The difficulty is that unless you know your body very well, and even then it can surprise you, a woman many not always know when she is ovulating.

Although some women ovulate sooner or later on a regular basis, generally midcycle is considered when you are most likely to be fertile. Since you had unprotected sex, and it was about a week and a half after your last period, odds increase that pregnancy may be a possibility. But, keep in mind, even for couples who are actively trying to get pregnant, it can take many months to happen. So, even though you may have had sex at a time that is possibly a fertile time for you, the odds are still in your favor that you won't be pregnant with it being just this one cycle.