Late period, advice? Next steps?

My period is 8 days late! Last month around Xmas, I missed some birth control pills. I have continued having unprotected sex with my SO since then. He pulls out, but sometimes I think he pulls out a little too late. Anyway, AF hasn't shown. I thought I possibly conceived that same week of Xmas, in which case a hpt should have shown positive by now. Then, a about 5 days ago, I thought for sure that AF was coming. I had cramps, but then only a little brown discharge and nothing since. So, my question is, is it possible that I maybe ovulated later than I thought, and that cramping and discharge was IB? I also haven't been hungry at all, I have to make myself eat. I don't get nauseous, I just don't want to eat for some reason. ( don't worry, I still make myself eat even if I don't want to) I also got light headed a few days ago. I took a pregnancy test yesterday, and 2 days before that, negative. I have no idea what's going on!! I haven't been taking my birth control until I get my period (or an answer). If I were pregnant, it would be a good thing bc we planned on stopping birth control anyway! When can I test again? I know that sressing about AF might make it late, but 8 whole days late??? I've never been late, and I've been far more stressed than this before.