can't conceive since MC

ATraveler
Looking for some hope. Lost my baby in a MC at 7 weeks, 2 years ago now. We had just started trying and conceived on attempt 3. After MC, we waited 3 months before trying again. Nothing has happened. I have taken pre-Natal vitamins almost every day for 2 years. My husband has fathered 3 kids with his ex-wife but got a semen analysis to double check to make sure it wasn't him. All came back normal except his motility was on the low side of normal. I went through all the tests. Mine was normal except my progesterone was on the low side of normal and my MC was due to low progesterone. I had an HSG- normal. I'm going to start progesterone cream this month but what else can I do to help this? I've done the OPK kits, CM tracking, and I've tried the opposite of just "not stressing" and taking a more carefree approach. Nothing is working. My DH is 10 yrs older than me and so if we don't make this happen soon, we decided to accept this fate as we don't want him to be too old (he is currently 42). I'm feeling defeated and upset. I don't want to do clomid or famera because of the side effects. Any help? I'm open to anything.