Was it a miscarriage or an ectopic?

Paige • Trying for baby number 1 with husband of 3 years. 1 Miscarriage & 1 Ectopic. Come on rainbow baby! 🌈💖👶🏼

We’ve been trying to conceive almost 2 years now. I had a miscarriage in September then an ectopic this month. I’m presently going through methotrexate treatment as I have high HCG numbers that didn’t budge at the first injection so required a second (7808 on day of first injection, 10376 on day 4 then 9878 on day 7). I’m starting to wonder if my miscarriage was actually a miscarriage or an ectopic. I had rising — albeit slow rising — HCG numbers that were on the lower end of normal but then one day experienced cramping and woke up the next day bleeding a ton. There was no ultrasound done. This time my HCG levels have been going up normally but they couldn’t find anything in my uterus on early ultrasound and did find an ectopic in my left tube. I haven’t had any bleeding at all, just twinges to the side that my ectopic is on. Does anyone have insight on this? How did you differentiate between a miscarriage and an ectopic?