Possible symptoms?

So I'm on Cycle Day 13, my ovulation day is tomorrow based on my tracking on this app. I've been cramping a lot more than usual around this time in my cycle, I've also been having more discharge. My lower back hurts a lot lol and I just feel weird. Im constipated too which is strange for me because I never have any issues having a BM. I've heard of women feeling symptoms super early. Im just wondering if any other ladies have had early symptoms and got a BFP?!