Help Please

I had a miscarriage in July, we started TTC right after I stopped bleeding. My last cycle was 50 days long, but before the miscarriage my cycle used to be 40 days. Glow said I ovulated yesterday, but I've had sore breasts that continue to get worse for about a week now. I took 3 ovulation tests; on Tuesday, Wednesday, and yesterday, all of which were negative. Is it possible that my cycles can fluxuate after a miscarriage? Could I already be pregnant? I just have a feeling that I am, call it an intuition. I'm on cycle day 27. Update: I took a pregnancy test, knowing it would be negative because it's so early, and it was. It's still heartbreaking to see a negative even when expecting it.