I had sex with my boyfriend on the third of December. Im on birth control and he came in me but a lot of it came out and I had missed my pill the day before. But since around or a little after the day we had sex my nipples have been tender and I'm know I'm not pregnant and he didn't mess with me in that area so what I am wonder is if there's a reason for this because its never happened before and also its not because of my period because I don't get that till later in the month