Hoping for my rainbow

I had 3 miscarriages at the end of last year and I just found out thursday that I'm pregnant again... My hcg went from 21 to 98 from Thursday to Saturday but when I had my other losses I miscarried days after finding out I'm pregnant.. Im on progesterone vaginal suppositories and hoping this makes the difference... I have an appointment for an ultrasound March 15 but I'm so nervous and wish they would do another blood draw so that I could see the numbers rising... Anyone else in the same situation?