Hormones and Periods TTC

I have a question. We're TTC our second child. I was previously on Mirena (about 2 years) and then had it taken out. Directly after that I went on the pill and had a few periods. I got off of it around March and had one then. I hadn't had a period in about 3 months or so and just started yesterday. I've been taking pregnancy tests to check bc I wasn't having periods and we were hoping for a BFP. I've also been having hot flashes here and there, so I know my hormones are off. When we got a BFP the first time I hadn't been on BC but for a month or two. Could it be that my body is still adjusting to not being on birth control and that's my problem with my hormones? Also, with my hormones being off, that can make it difficult to get a BFP, right?