is anyone pregnant in a relationship but not with the dad?

my ex and u got together again after breaking up for 4 months and i was 8 weeks pregnant at that stage. i got pregnant the first time i slept with babys dad after a short 1 month dating but i just wasnt feeling the same as him. things have been so tough because my partner hates its not his baby and just seems so immature when i need a man the most. worst thing is babys dad wants to be a family unit and was falling in love with me. i feel like my OH just isnt helping me like i need him to. around the house he does the clothes washing and packs and unpacks the dishwasher but nothing else. ive been so breathless and sick and depressed during this pregnancy. im 15 weeks now and just feel like i should go back to babys dad even though i dont love or fancy him just to get some support and understanding. maybe things would grow?? i used to think i loved my OH but now i feel like he will never be what i need. my house is a tip and i dont have the energy or life to fix it. i just want to curl into a ball and die tbh. i have cystic fibrosis too and my health is suffering and just days ago they discovered a partially collapsed lung. i cant walk the length of myself never mind do housework but its seriously affecting my mental health. what do i do?? 😭