Ovulation

Glow said I was fertile this last past week. Took opk and go solid smiley xmas and day after. We had sex everyday of the week. Tonight I feel slightly crampy. I don't know if u 100% trust the opk bc I have been trying for 9 months with no luck. I am a 29 day cycle this time so they say it could happen from day 13-17. I think I am on day 15. But according to opk I have had my fertile days. Should I keep having sex? Cramping from ovulation? Confused....