i think im pregnant because: on dec 7-9 i had a very light period. I have sensitive, swollen breasts. I also noticed very dark blue veins on my chest. I'm experiencing severe lower back pain. I also have been feeling faint and nauseous in the morning. *I dont think i'm pregnant because i had negative hot (i would be about 5 weeks). i have PCOS. We use condoms. I've been stressed out. What do you think?