Can sperm cause recurring miscarriages??

Zara • Trying to conviece first baby after 2 MC`s, June & August.
Ok so I've just had my 8 weeks check up. I thought my miscarriages were caused by my 5-6cm fibroids but apparently their not even near the uterus. I only have 2 fibroids on the surface of my uterus. 
The doctor said maybe I've just been unlucky. But I was just wondering where it could be my partners sperm causing the issue. 
We haven't done any tests on his sperm yet. But as we have just started trying again I'm soooo scared something may go wrong. 
Any help please 

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