HCG levels go up a week after miscarriage

Bee

I just experienced a miscarriage Tuesday of last week. Had positive pregnancy tests for about a week and a half and then had really intense cramping, and heavy thick bleeding (idk if I saw any tissue) for 5 days. I was seen by my doctor on Thursday, blood test was run and HCG was at 154. Ultrasound showed no sac or anything confirming miscarriage. I went in for a second blood test on Monday and my HCG is now 188. I have a unicornuate uterus with only one good tube so I’m really concerned this could mean eptopic. Has anyone ever experienced anything similar. Trying not to freak out about it, but was told if I have ANY pain to be seen immediately and now I can’t help, but freak out.