What is happening to my body?

Okay so my predicted period is 5-7 days away. I’m on CD 30 today. My last cycle was 28 days but I’m usually 35ish. I have the last few days, for a bit of the day, have a lot of discharge that’s kind of snotty and watery. A few days ago I had some CM that was like jelly in texture but it was yellow. I’ve also noticed my vagina smells different. I don’t think it’s a bad kind of smell (like it’s not a candle scent lol but it doesn’t smell like an infection) and I don’t have any itching or burning etc etc.

I’ve also been peeing a little more frequently but it’ll just be small amounts. In addition to all that I’ve had cramps. I actually thought I started my period yesterday while I was waiting at the vet. I don’t usually get pre-period cramps, the day off I’ll have them and then I usually know I’m starting. I’ve taken a few tests but they’ve been negative so far.

Has anyone else experienced these things?