I don't understand.

I used to always have irregular periods. After I had my daughter I got an IUD. Had it for about 3 years. I got it removed last year so I could start TTC my second with my fiance. We got pregnant instantly. Unfortunately we MC in November. Since the MC my periods have always started on the 9 or 10th of the month, and always lasted three days. This was our first month TTC since the MC. I had a normal period in July. Then comes August 😑😑. August 1st I bled for ONE day, and had no bleeding/spotting since until today. Glow predicted my period tomorrow, so it was very close. I'm just annoyed that my periods became regular, and then the month that I started trying they became irregular. We BD every other day, I thought for sure we would fall pregnant. My daughter was a happy surprise, she only took one month to conceive ( not trying). My angle baby also only took one month. Now my periods are all over the place, and I'm just very confussed and concerned that it may take a while to actually fall pregnant again.