Advice and help - new to this!

Kayla
I came off BC pills in May (after 8 years) and have been actively TTC since July. My cycles have been a little irregular...
May/June- 39 days 
June/July- 31 days
July/August-20 days 
I'm now on day 35 of my cycle and no AF yet. I've been cramping off and on for 2 weeks, sore nipples, and very watery CM (to the point it's getting to my underwear). 
My OPK gave me a smiley August 21st - cd 9. I've taken HPTs twice since my supposed "missed period" (9/13 start date) and they've all been BFN!
What's yalls advice?