Why is conceiving so stressful :(

My boyfriend and I are still trying to conceive our first child , but mentally emotionally and physically I am drained. While everyone around me are having babies I can't seem to find the problem with myself. We've tried constantly but nothing has happened lately. I've had a miscarriage almost 5 months ago and that took a toll on me and after that I've been trying but I can't seem to get pregnant. I thought it would be easy to become pregnant but I see that it's not :(. I've taken so many  ovulation tests had intercourse on those days but still no baby. We've had intercourse on my ovulation date this month (May) but I don't think I'm pregnant because of the cramping/light bleeding as if AF is coming. Is there any advice that you all can share ?