A new man a new chance

My ex husband and I tried for 8 yrs! Together for ten first two yrs when I was 21&22 we had two miss carriages and it broke me, but we went on and just had sex when we felt like it etc! Well hes now my ex husband (just didn’t work) and sadly his gf of 2 months, screenshot me a p. Test very very faint line sayin,they were pregnant I was shocked bc I’ve had a dr.say, b4 that there is nothing wrong with my body! So I’m so shocked and sad I’ll admit but I wish him well! I’ve gotten serious with greatest man! He’s what I’ve always wanted in my man!! I’m finally trusting and happy for the 1st time. In ages! My friend Beth says some ppl just don’t mesh and there DNA isn’t meant for them to make a baby? Anyone ever heard that or have had similarities happen bc in 30 now and I’m not ready give up yet! I can’t I’ve been accepting to the ideal of not being a momma! I need my miracle baby! We just signed up for the fertility program so I got 1 year so what’s y’all take on this ty