How long should we try before checking with my Doc?

Kennady

I miscarried in July, got my cycle in sept. I’m a healthy, semi active 21 year old. This is our 3rd month to try with no luck. I know that isn’t very long for so many women, but i feel since we are both so young and have no known health issues maybe we should talk to my doctor? My mom has had 3 miscarriages and all 3 of my sisters have had at least 1. How long should we try before talking to my doctor?