Should I get help or just wait?

The first time I got pregnant it took me 3 years and 4 months. Had a miscarriage at 8 weeks. Then 4 months after that I had a chemical pregnancy. Decided to go on birth control last year from January to August just to see if the go no birth control then come off trick would work. I had another chemical pregnancy this month. Should I seek an infertility specialist or just wait to see what happens? I've changed partners since last year idk if that matters or not. My current partner already has a child. We got together in January of last year been ttc since August.