Advice please?

Ladies I need your opinions....

My OH and I have been bd after having my coil out in June. We've not been trying hard just seeing what happens. My AF was on 12 th Aug (only had 2 periods of about 31 days apart) and this app keeps moving my fertile week this month as I've not had a full positive ovulation test. I've no idea what's happening to me!!

For the last 3 days I've been bloated, had low aching pain in abdomen so much so that I can't sleep on my stomach and am uncomfortable on my side. I've been Moody and tearful and my boobs hurt a slight bit.

I've no idea when I can test or when AF is due as the calendar keeps moving.

Has anyone any ideas? Thanks xx