Hi ladies I wondered if you could help.

I’ve had 4 miscarriages and my most recent one was January this year. I’ve been ttc for 4 years now, I was diagnosed with pcos but my gynaecologist has tested me and said there’s no reason as to why I keep miscarrying and I should just go away and try again. I’ve heard about tracking your fertile days but i don’t how to do it properly. I want to track it down to a T. Obviously with pcos I don’t ovulate as regularly as others, and I’m in the process of loosing weight. Any advice?