Hcg level very low , confused ?!

I had a miscarriage last year at 24/7

Am pregnant now my last period was 9 June 2017 , i take a hpt and it was a very faint positive after my missed period then i had blood test is was positive by 24.9 hcg level then i had another blood test 14 days later hcg level was 28.9

P.s i had sexx only at 23 , 25 , 26 this month !

There is no bleeding , backpain and sore breast also nausea

My doctor appointment next Monday, but am getting crazy right now and i dont know what to do !!!

Anyone know what is this or had the same experience and the pregnancy was healthy?