Confused

It’s been 5 weeks since my miscarriage & my hCG levels still didn’t come back down. Last week they went from 44 to 77, I’ll be getting a call tomorrow to see this weeks results. I’m still nursing my 17 month old and this week my nipples are really sore only while nursing. It’s really bad. Is that normal? I didn’t have any symptoms to begin with, I didn’t even know I was pregnant till the day I miscarried so I don’t understand why I’m feeling this now.