Yes, after 3 miscarriages in a row there is a chance that something could be amiss, most problems can be fixed easily. Good luck.
It could be anyone of you actually, I would suggest that you visit as trying43 said a specialist who can further assist and advice you.
I would see a dr preferably an re who specializes in fertility problems and have testing and an ultrasound to check for any problems. Your partner probably needs a sperm assessment. Good luck