Hcg levels off, help!!!

Okay ladies I took a at home pregnancy test and it came up immediately with positives. A week later went to doctor to get a referral to confirm my pregnancy. 3 days later I started bleeding like a period. My hcg levels were at 129, then two days later 135. Should I be worried I miscarried??? Tell me your positive outcomes if your hcg levels were low at first. I can only be about a month pregnant. I go to my OBGYN on Monday. Help a momma out.