Clomid ovulation day before period due? Please help.

Hello,

I started clomid this month, days 5-9. I ovulated on Cd15. I had blood test completed on day 19- progesterone level was 27. My period is due tomorrow on Cd29. Pregnancy test negative. OPK is positive. Does anyone have experience with this? Am I ovulating again without a Period in between? Should we BD? I'm so confused.