ovulate, intercourse, then period..😔

Ka
Good evening ladies, 
I'm 27, and I'm TTC. I have a regular (on time) period. Heavy egg white textured CM, I'm having sex during my ovulation window, but I'm still not conceiving. I get the whole idea (when Gods ready to bless you with a child then you will have one) but I do think it's a good idea to educate myself on what can possibly be the issue with women who are/have been in my shoes.. please help me. I need some advice. Thanks in advance.Â