I feel upset :(

I am 20 years old been sexualy active for one year now with my fiancé now & I haven't gotten pregant every month I get very upset knowing that we have so much sex every month even when I ovulate still nothing is scary I have a physical in August I'll talk to my doc about 
I was two days late and ended up getting my Af today I was sad I hope I am okay and I am able to consive