Had sex on 1st day of my period (9/17). on birth control pills for years. now 2 weeks before my period, i have swollen breasts and have been experiencing cramping. possible preg? have a negative preg test so far.

There are 2 reasons: that unlikely that you're pregnant. First is that you're unlikely to get pregnant during your period, especially the first day. Second, you've been on birth control for years. On the other hand, a pregnancy test this soon is likely to be negative even if you did conceive. In your case, swollen breasts and cramping are probably from random hormone fluctuations rather than pregnancy. Dr. Anne.