HCG Levels

Natasha • Christian, Happy Wife, Mama of 4 Girls, Expecting Baby #5
Okay so my doctor says my Hcg levels are rising but not doubling like they would like she said last time that they were pretty close. They put me on progesterone and it went up and is now a 18.8. But im worried about my levels not doubling. So my question is has anyone had a similar situation and had a healthy pregnancy?