2 miscarriages in 4 months.

In September 2017, me and my bf found out we were expecting. We were so excited and shocked it happen so fast, but my levels were just not where they needed to be and we lost it. I tested positive again in December, and the doctors are telling me the same thing my levels are higher than the first time but not increasing like they should be. He is being so supportive but I’m taking it so hard. I just don’t understand why and the doctors don’t have any answers, they want to do blood work and test him. It’s so heartbreaking. I don’t know how to get through two in a row. Any advice would be wonderful. Praying for all who have suffered the same pain I am going through.