at a loss with my losses

I had my first miscarage at 15 weeks January 4th. it was a boy and we named him Isiah. we conceived again a few months later and 15 weeks later come July 5th another loss. we ended up naming her Helena. we got caught up in the throws of passion recently and got pregnant again well 8 weeks later (yesterday) another loss. I know that it takes time for the body to heal and this last one wasn't planned. I do have 2 healthy children ages 2 and 3 so I don't understand what has happened or why and I'm fully broken. I know the only reason I am functioning is for my kids. how do you cope ?