Help?

UK mum||Little boy💙

Okay so for the past 3 weeks I’ve been getting serial serum Bh-cg tests done because I was miscarrying. My levels went from 700 and slowly descended up until last week where it was at 60. I went on holiday 2 weeks ago (still bleeding etc) and had intercourse with my OH. Today they were hoping my levels had gone down to 10 or <5 but it’s RAISED BACK UP TO 80?!?!? They want to give me methotrexate without scanning me first. Literally has anyone had this happen??? I’m so confused