Suggest a specialist or...

Kia
Me and my fiancé have been together for 2 years. We've been trying to conceive for awhile now and I'm not sure if it's my irregular periods or on his end. We have seed CONSTANTLY but there's a negative every month. I've even asked if he has conceived and he had told me yes, twice actually. And both times there were miscarriages. So I'm really not sure what's going on but we're trying hard. Should I suggest a specialist for him or just wait to see what happens?