Likely to be pregnant?

So im on the pill but last month during my break off it me and my partner had unprotected sex and he finished in me. I know it’s unlikely that im pregnant (we aren’t concerned if I am) but for the past 3-4 weeks I’ve experienced symptoms I’ve never had before, well at least for this amount of time.

I’ve had constant lower back pain, cramping, sore boobs, I’m peeing constantly! As well as more discharge than normal and basically just not feeling myself at all. If I’d had these for a few days I wouldn’t think nothing of it but having it continuously for a few week now it’s got me thinking. What do you think?