af late, need thoughts and opinions

Okay, I apologize this might be a little long. I'm annoyed with my body. I do not use ovulation strips because I felt like it was going to put more stress on this whole thing. Boy was I wrong. Knowing when I ovulated probably would of helped me so much. My period was due 2/15, that day a physician assistant at my work that I am friends with (and knows I'm trying) had me do blood work. Sometimes I think she's more excited than me (haha just kidding). Well about 30 minutes after the blood was drawn I started getting cramps and I was like of course it's gunna come now that we just did that. AF never came but bw was negative. It's now 4 days later I had light cramps on 2/15, 2/16, and 2/17. Even some discharge where I had to check and see if it was my period. Not any other signs of my period, no cramping in 2 days. I'm just confused. I just don't understand why my body has to do this. I mean I had blood work I know I'm not pregnant I just want my damn AF to show up so we can get started on trying another cycle. But of course with AF not showing there's a part of me hoping there is still a chance. So my question I guess is, has anyone had anything similar happen? Any chance I'm still pregnant? Any insight or advice would be much appreciated! Thanks in advance