HCG levels..???

Back story. I had a MC 1/19 had my first cycle 2/23... had negatives at 7days late then @8 days late I got a vvvvvvfl. Then @ day 10 of being late I got my positive. Well I’ve been tracking sex and everything. (We didn’t have sex much so I thought negative would be right) I had sex 3/3 3/6 & 3/7.based off my LMP I should be 6 weeks today. I just got results back for my HCG and they were only 88. This is my 4th pregnancy && I’ve never seen it that low. Anyone know what this means? I see the doc Monday. But I’m gonna go crazy this weekend wondering.