I just went through my last cycle (first cycle post-m/c), and I had all those same thoughts. Literally a couple of days after I ovulated, I started worrying that maybe we shouldn't have tried so soon. Then I got hopeful again, but I didn't want to be too hopeful. Then I saw the good in AF arriving, and I convinced myself that it would be best to not get a BFP. Then I had the positive IC on 9 DPO, and I got super-excited. It was gone the next day, so I assume it was a chemical pregnancy. And I was okay with that because of all the reservations I had earlier. Then the AF cramps came, while I was traveling. I literally started crying while walking in the airport, and I had to go into the bathroom to let it all out and re-group. Then I got really angry that AF was there and my body wasn't working right. And I told DH, "Maybe we just weren't meant to have children. Maybe we can just be happy, the two of us." Then I had to smack some sense into myself, and here I am getting ready to O in another cycle.
I share all of that just to say that you're going to go through a gamut of emotions, no matter the outcome of this cycle. But I know that whatever that outcome is, you're going to be just fine. We are resilient women, and you'll make it through. And we're here to talk you through it if you need the support.