In need of help/advice from you Glow ladies..💬

I don't really know how to start.. but last year my cycle became somewhat irregular. (I'm about to turn 31) For example sometimes my cycle would be around 60 days but never longer than that, and that happend 2 times. Now at the beginning of October i had my last period and i haven't seen it since. According to the app i am now 71 DPO, which is crazy to me.. i am not pregnant as far as i know because there was no intercourse between october and late december.. now that is what has got me a bit worried. I am not on BC but had unprotected sex the 21st and 22nd of December. I have been feeling real weird lately but i try to brush it of as nothing, i even bursted into tears today out of nowhere while eating a sandwich😂 can't even remember what i was thinking about, i laugh about it now because that was so random. Anyhow, i think my question(s)to you all is.. should i take a p-test? Is it possible to have ovulated without a period? How do i know when to test for accurate results? And IF i am pregnant, how can i calculate how far along i am being 71 DPO without going to a doctor? I hope someone can help me somewhat with these questions. If you came this far, thank you for reading.. i needed to get this of my chest.

Last period; from oct 9 -13

Fertile window; from oct 26 - nov 1

Last noted ovu; oct 31. (I get light cramps when ovu)

Side note; been having wet milky CM for at least 2 weeks

Been feeling like muscle pain in my pelvic/groin area

Sensitive nipples

Bubbly feeling lower stomach

And lower back pain while walking on and off

Thanks again🙏