Still trying after 5 years

Hello my name is theresa I been trying to get pregnant for 5 years now since I was 15 & now I'm 19 smh every time me and my partner do it he cums in me(TMI SORRY) & then the next month I get my period I feel so stressed out & all I do is cry & I think about maybe it's me I can never get pregnant or what I feel so hurt bc all I want is a baby Ik they are expensive but I'll do my best to take care of mine :'(