I had to stop my birth control due to varicose vein treatment I'm about to start. I've been on because since 15 yo and I'm now 25. I did have unprotected sex with my boyfriend around normal ovulation time. I'm 2 days late and experiencing nausea, extreme tiredness, changes in breast size and nipple color, very sore breast, sensitivity to smell and slight cramping. An at home pregnancy test said negative. Could I still be pregnant or is my body just getting use to being off the pill?