HCG-BETA?

💗louise💗 UK • Mummy to 1 prince and 2 princesses 💙💗💗 pregnant with our 4th little one our 2nd boy 🥰💙👶🏻 due January 2020
Hi, if my bloods are doubling around every 30hrs is that a good or bad thing?
I had them done on Friday 24th February and they was 70 at 3 weeks 5 days and then had them done again on Friday 4th march and they was 3020 at 4 weeks 5 days. Are these good numbers? 
Thanks xx