Doubts about the changes in my body during my cycle

I've been using Glow to track my health log for over a month now, but, I'm still not sure I'm doing it right. My basal temp spikes a lot, could it be because of the hot weather? Sometimes it is cold and my temp is a bit high, but I'm nowhere near my ovulation or ill. My cervical position always seems to be low and closed. The only thing I can tell its different along my cycle is mucous and it's only the quantity. I'm 33, never pregnant, but my cycle is very susceptive to stress. I'm not TTC and my contraceptive methods are FAM, withdrawn and, occasionally, condoms. Any advice?