15 DPO all BFN's ! can i still be pregnant??

I am two days late. 2. 15 DPO CD 29. patiently waiting for my period! I dont have a faint or anything. I am having terrible nausea and uterine cramps. i went from going up to a massive appetite to barely having one at all, I am completely turned off from meat for some reason. but no matter what. BFN. its torture. I've accepted that I may have had inovulation despite the positive opk's because my body was adjusting my hormones due to just getting off of BC. OK then fine. if ovulation was delayed then by how much!!!???!! where is my period?! Am I actually pregnant but getting false negatives. I need help. for the first time in my life I don't know my own body and I hate that.