For the past year I've been on the birth control pill Diana. In the last month my partner and I have decided (as the hormones are making me crazy, and depressed as it has affected my weight) that I will come off them, and we'll use a non-hormonal form of birth control. I missed the last three pills to have my period start on a different day. Also I have been on Antibiotics. We have, on multiple occasions had "unprotected" sex.

Generally my period is five days, two heavy, two light and spotting, they have been exactly this the entire time I've been on the pill. This last one has been two VERY light (pantyliner days), and two spotting (only noticeable when wiping). I'm also experiencing headaches, an "ill" feeling (light headed, sick but not sick), cold-like symptoms, and having vivid dreams (highly unusual).

At this point I think I've panicked myself into a corner. Is this possibly pregnancy (and how likely?), or nothing to concern myself with?