high temapture

Sorry if it's long, but I'm a little confused. So I have a lot of fertilely apps their usually on the dot about everything. I took an opk and was starting to get a positive the 14&15. Both those days my so and I had sex. But that's all the sex we had that month(been busy). We haven't used protection in a year and nothing. We were going to really start ttc after my period. But I'm still waiting on that.. My apps said I should of started a few days ago, or next week now since  I haven't had it yet.(yes I know it's only a prediction). And my period isn't really regural, but it's usually only off by a few days or so. One time it was off by a week. So maybe that's when af is going to come is next week? Im just confused, I haven't had many pms signs besides feeling a little crampy, and since yesterday and today my boobs are starting to get tender,getting headaches/migraines(all normal pms for me) but I thought it'd come by now? I've been testing and everything and been a bfn. But I just took my tempature(I haven't been active) and it was 99.1! Wth! I'm not getting sick or have been sick and I haven't seen my tempature that high in years. I'm super confused what's going on. I'm really trying not to get my hopes up. Bfns just say it all really, and that I haven't been able to get pregnant, and I really don't think I am/don't have that gut feeling I am. I tested in some hopes honestly but also cause I thought I was suppose to have af already. Just wanting to hear some insight what I should do/your experiences? Thanks!