Well, early pregnancy often doesn't have any symptoms at all. I would think in terms of when it was that you had unprotected sex. Could you have been in the more fertile time? Close together pregnancies happen for sure. (had one myself, my kids are 15 months apart in age). If you are late for when you expected your period, take a test. If it is negative and you don't get your period, take another in one week. If you breast fed at all, it can make your periods/cycle wonky. The test is really the only way to know. Come back and tell me! If you ARE pregnant, I'll give you the ins and outs of two little ones close in age. I survived. LOL But it's a tiny bit chaotic.