Hcg blood testing


This is my 3rd pregnancy both of my other 2 went very smooth no issues this one I’m feeling kinda nervous. they have had me going for 48 hour blood work since last week they keep saying the beta hcg is going up as it should. I can’t help but think something is wrong and that’s why they keep sending me I will be 6weeks tomorrow if my calculation is correct. Has anyone else had this happen if so did your doctor ever give you reasoning other then making sure the numbers are rising? My numbers have been 43, 79, 397 and now they are 983.