Advice please

I am 35 weeks today, earlier on this evening I was at a restaurant eating dinner, all was absolutely fine until I got up to go for a wee and came back, once I sat back down I suddenly started getting horrendous pain that sort of started under my boobs but above where baby is situated, so mainly over my rib cage. It felt like a really bad stitch that went the whole way across and was the most intense in the middle. The pain was on and off every 5-10 mins for around 30-45 mins. I was also getting upper back pain along side it.

I phoned my midwives and they said basically to take some paracetamol and call them if it comes back. (I was still getting a dull ache but the intense pain seemed to of subsided)

But they didn’t tell me what caused it, or what it was. I just want to know if anyone else had anything similar and what happened? Did you go into premature labour? Was it just gas? Was there another underlying problem?

I’ve also had the tiniest bit of blood when I wipe and a really sore, swollen vagina.....

Just feeling 😩