Confused

I started femara this cycle. Cycle days 3-7. Around cycle day 6 and 7 I had positive opks. I only tested because I check my cervix and it felt high and soft. But I thought I couldn't possible be ovulating, I was still spotting from my period. Then my cm turned creamy at the start of my fertile window, the 3rd and now today I'm on cycle day 10 which i can normally start to expect ewcm. I'm dry as a bone and very neg opk. I'm hoping the femara just made my cycle weird and I'll begin my fertile cm in a couple of days. Anyone have femara do crazy stuff to their cycle? And what was with the pos opks so early on?