I need help/input!!!

I’ve been taking my opks since my cycle started.. it was originally three days late & on the third day I got a positive opk then started spotting.. spotting lasted 4-5 days , slightly heavy but not normal period.. fast forward to CD10 I received a bfp LH surge ..this was on last Monday .. the lh surge stayed positive until Thursday evening. Well it’s now Monday again and they’re back to being really positive.. I’ve taken hcg test and they’ve shown negative even went to the OBGYN while I was bleeding and she saw nothing ... can anyone tell me why I’m getting so many positives?? ... not to mention prior to going to the OBGYN I had 4 positives and some negatives in between- she ruled it as chemical pregnancy