Low to high fertility, then low??

Lauren
We have been trying to conceive since October. I was on birth control for 15 years and I know my body is still adjusting. But getting pregnant so quickly (november, which resulted in a chemical) I'm left with a huge question mark in my head. I typically have low then peak, never the high (flashing smiley) on the CB OPK's. This month, I had several days of low, then two high test yesterday...today, I tested low. My period was also a day or so longer this month. Not sure what to think. Is it true as long as you're getting your period you're ovulating? Should I thinking that we're out this month and start stocking up for March? Thanks ladies!