Hurt ...

I've been ttc since December with no luck and my husband have questioned me why we haven't got pregnant already since his kids mother got pregnant in the 3rd or 4th month & I get upset because I lowkey feel like maybe I can't have kids since I tried for 6 months with my ex and I never conceived. Well Friday we was talking to his mother and he said "We been having unprotected sex and she can't get pregnant I dont know why" and I didn't hear him but a second later I realized what he just said and she kept quiet (his family es super sexist) and she said "some women take long, or just cant" but she thinks it's my fault since he already has a kid. I felt super uncomfortable and after the conversation when we was in bed I told him in done TTC and I feel disappointed with myself and worthless I cant give him a baby and he just thought I was being emotional and tried to baby me with I appreciate a lot and just said that we should keep having a regular sexual life and don't worry about it (my husband never worries about it but I do) and I don't know, I still feel a little hurt and not with him but with myself. I just want us to have a family and make my husband happy...

Ps: I thought about trying preseed ?