TTC after miscarriage in 30's

I had a miscarriage on Christmas and need to wait two cycles before my doctor says we can try again. So that should be around March. But I turn 35 in April and am so scared that it won't happen again. We conceived very quickly the first time but I am convincing myself that was a fluke and won't ever happen again. Does anyone have a similar experience or been through this and had a healthy baby?