Your beta is still going up. It typically doubles every 48-72 hours. Your second test was 48 hours. It's not quiet double but it is still increasing and it is doing so in large quantities. Try not to stress it can cause the baby stress which you don't want. Try and relax and take it easy.
Try to relax, stressing will only make it worse. I know easier said than done.
With my first, my first beta test came back at 21- barely positive. 2 days later it was at 41 exactly. So double. 3 days later I was in the 200's. Everyone's body is different. Try to stay positive! I had Brown spotting at 10 weeks with my first and I was bed rest just to make sure. I had an ultrasound that following Monday and my baby was perfectly fine. I had a normal pregnancy and a healthy baby girl.
Again, try to stay positive. Numbers are rising that's a good sign, everyone's beta numbers vary from person to person