Hey Hon,
Your chart is quite hard to read as you have not put many temps in. But it looks to me as though you may have ov'd on CD18. That's a bit of a guess based on an apparent rise and your history of ov'ing on day 18/19. Fertility Friend would need at least 5 or 6 temps before the day of ov to give you your lines. You are supposed to bd every day of ewcm and you'll know when you have ov'd as you will dry up and your cervix will rise up, close and will feel firm. Bare in mind that it is easy to confuss semen for ewcm. Can you feel your cervix and tell what position it is in?
Becs