I dunno where this is being posted vut i need to het this off my chest and get a little advise

Me and my husband hve been together 5 year in first year we had 3 miscarriages. After tests we realised he has slow swimmers and the likelyhood of him farthering a child is unlikely. I want my bundle of joy!… so after discussions of adoption, fostering and sperm donors hes said “i will leave you if the child isnt biologically mine”

So here is my confession… im secretary having relations with his friend as he has same hair colour and eye color as us…. im hoping ill get my bundle of joy but non of them know my intentions…
I dunno if its rights or not but i want my baby!