Cm/ovulation

I haven’t been able to buy an OPK so I’m trying to track ovulation with a calendar and cm. I had sex on the days with hearts and the circle around the 15th is the day I should ovulate. Do you think chances of pregnancy are high at this point? Have I already ovulated or do you think I should wait till the 15th? Cm is in the last two pics. Very tacky/glue like. Kind of creamy (sorry if tmi)