Trying to get pregnant 🙃🙃

My periods are regular never had any problems of me getting them super late. I got my period on July 5 and lasted maybe about 6 days or so. In that month I was having unprotected sex many times and my bf and I thought I was going to get pregnant which we were kind of excited about. August came, the week I was supposed to get my period I didn't. I took about 2 pregnancy tests all negative. I was having a lot of early symptoms as well it was so weird. I just got my period two days ago after 3 weeks of being late and it was really hard I thought I was maybe going to end up pregnant. I want to know when is the good time for me to get pregnant this app says the 4th of next month while this other app I downloaded says not until the 16 of next month. Should I try both days? I need answers I been having baby fever! Thanks so much.