Me and my boyfriend use condoms and avoid having sex around the time I think I should be ovulating. But for the past year my period has become irregular with random but few regular cycles.  Me and my boyfriend have been dating for 4 months (also the same amount of time we have been sexually active together) and according to my period tracker Im 18 days late and I took a pregnancy test 12 days after my period "should have started" that came up negative. I hoped to start my period soon after but when my nipples and only my nipples became extremely sore (when normally my entire breasts become sore) I became worried.  Its been 5 days since they started hurting and they are still extremely sore and sensitive. On top of that I have  noticed that I've been having a lot of vaginal fluids and I feel like I might be urinating more than usual. Everything I've looked up has told me a mixture of my hormones might be changing, I am pregnant  and Im not pregnant.  Im 19 and id like to have a better idea of what might be happening with my body so if anyone could help Id really appreciate it.