How should I feel?

We miscarried at 9 weeks mid-March and have had 2 cycles since, I’m due on in 7 days but I have that gut feeling that there’s a tiny chance we might be pregnant. I’m so scared. What if it happens again. What if it doesn’t. What should I do differently. Did I cause it to happen last time? What did? Feeling sore boobs, fatigue, that weird stretching sensation at the sides of my stomach. All could easily be explained away as hot weather and pms and perhaps I’m being hysterical but I’m on such a rollercoaster of emotions. How are you meant to feel? Am I making symptoms up in my head because I’m so desperate to be pregnant again?