HCG level?

I'm around 4 to 5 weeks estimated from the day of my ovulation peak. My OB said I may be earlier than we thought since I ovulated a little later, so we don't know exactly how far I am. I got some blood work done on 7/7, it was at 61, then again on 7/9 and it was 99. My OB wanted to repeat it since it increased but didn't double. I got the blood work done on 7/13, it was 480 and on 7/15 it was 1131. Is this okay for being at 5 weeks? I had 2 miscarriages before this pregnancy (1st baby) and I'm kind of worried.