Recurring Chemicals

I’m at a loss. I had an ectopic at 6wks 4yrs ago and a miscarriage at 5wks 6 months later (same partner). Now we’ve been TTC with my current partner for 18months now. I’ve had 2 chemicals right around 4wks this year (actually believe it was 3 but I didn’t test one month)... But here I am, all my fertility tests came back “normal”. Why after so long can’t I have my rainbow 🌈? 😫