Advice needed.

I have had a total of 4 miscarriages. The 1st I was very young so that one was more a blessing in disguise. And a couple were stress related. Me and my boyfriend are wanting a baby of our own. He already has 3 kids and he wants us to have one. There is a chance that I have PCOS as I have all the symptoms just the doctor said no. But my mom has it also what are some things that could help us TTC ? Not looking to go to the doctor right yet. Thanks.