Ok I started birth control dec 25 on a Sunday I've been taking it for four days and on Wednesday dec 28 me and my bf were both naked from the waist down and we were both turned on our sides and he rubbed his penis up and down my butt for a minhe did precum a little. After I got up and walked to the restroom and whipped where the pre cum was off my nipples have been chaning is it cuz birth control or am I prego pls help me out