someone tell me

Brittany • I`m 23•• currently pregnant with my first little angel blessing 💙👶🏽
someone tell me if this is a good rise.
got my hcg levels checked for the first time and they were 4, them checked again 3 days later which was Monday dec.1st and they were about 14,000. got them checked again that Friday and they had went to about 34,000 my nurse said. is that an okay increase?? that's not quite double every two days is it? now I'm worried.