Fertility doctor question

I'm contemplating seeing a fertility doctor to see if there is anything they can do to help me with my reoccurring miscarriages. I've had 3 consecutive losses and I honestly don't know what else to do!

I had a few blood tests done by my doctor, but he didn't find anything. My thyroid is fine and I don't have a blood disorder. He did suggest I take a low dose aspirin daily as a preventative measure. I don't have any underlying medical issues and I'm able to get pregnant fairly quickly. It's staying pregnant that's the problem.

Have any of you had a similar issue with miscarriages and seen a fertility doctor with some success? I just don't know if it's worth seeing fertility specialist. What can they really do to help someone in my situation?