OPK help?!

Hi everyone 👋 only recently started using this app. I’ve been off the pill now for 4 months and I’ve not had a bleed/period yet. I have been randomly tracking my ovulation and recently started doing this everyday. Last week I had some strange symptoms such as heartburn, metallic taste in mouth and EXTREMELY sore boobs. My OPKs have suddenly gotten darker. I am wondering does this seem like ovulation or early pregnancy I’m just so confused. I’ve taken so many pregnancy tests in the past and I’m so reluctant to actually go and buy one. Can anyone give some advice around this?! Thanks so much xx ❤️