TTC... Please help!

Currently have an almost 2 year old baby girl, had a perfect pregnancy and delivery with her. Decided on having another, so we started trying September of last year. Got pregnant right away, and miscarried at 7 weeks. Since then we have been actively trying, and I have been tracking ovulation but nothing. So tired of getting BFN. When do you look for help? How do you not stress? I'm at SAHM and it's literally always on my mind. Plus everyone around me is pregnant and I get asked daily when we will have another! Need suggestions please. Thanks♡