8dpo 2nd BFN.

So I have PCOS & this past month I went to the dr to have my annual and he asks me what I'm doing to prevent pregnancy, and when I respond that I'm not preventing pregnancy but wasn't trying (because at the time my SO and I hadn't officially started TTC) he asks what I'm doing to regulate my cycles and ovulate... I didn't have much of a response so he then scheduled me to come in and do blood work to see if I had ovulated this month or not. I did end up getting a positive opk about mid cycle & had several ovulation symptoms... we had sex several times, (literally 3 days later my bf and I decided to start Ttc), it's within my TWW and I've been semi-patiently waiting. I got my new HPTS yesterday so I decided to take a test and it was BFN, took another this morning with FMU & again BFN. I'm only 8dpo if I tracked correctly. Has anyone else had any success with opks and also has PCOS? did I test way too early ?? Yesterday i decided to check my cervix and I had one little speck of blood and haven't seen anything else. I've had slight cramping and have been tired but that's about it. Should I wait until I'm at least 10dpo? Any advice would help