Tmi but need help

So last month I though I was pregnant! Was just randomly nauseous and just felt this was it. I just felt pregnant! Sadly I got what I think to be my AF! I had alot of back pain.. more than usual but then only bled for two days and basically didn't need a pad anymore! Usually I need a pad for 4-5 days. I had yellowish discharge just a couple of days before which I read can be implantation! I got a positive ovulation test after that so called AF! I took a pregnancy test just incase but they keep coming back negative. Since Thursday I have been having pubic bone spasms and last night they were strong pubic bone cramps but now isn't bad. I've been cramping a lot and just not sure

what to do. Has anyone experienced this b fore?