No AF, what do you think?

So I’m not actively ttc anymore, if it happens it happens..so I’m not sure when I ovulated but according to App on my phone, I was due AF yesterday..I’ve had quite bad trapped burps (last 2 days, not tonight) and had quite bad acid reflux with it last night. Tonight I was CERTAIN AF started but nothing, milky cm (not too much) with lots of twinges and constant dull cramping in my uterus and a stabbing pain in my pubic bone that comes and goes. I don’t want to waste tonnes of money of tests, just want opinions that could point me in the right direction please! ✨✨