Ovulation issues

I’m 31 YO and have not been able to catch the peak in OPKs last 2 months. So I saw my gynecologist who asked me for blood draw on day 21 to check level of progesterone which came 6.4 !!

So she says I ovulated this month but I couldn’t catch it on the OPKs. However it’s been 5 months of ttc and no luck.

Anyone with similar experience?? Anyone went through day 21 progesterone test ? How long did it take to get pregnant!!?