HCG levels - Is this normal?

Hi ladies

I think I am about 5 weeks pregnant with our rainbow baby. Because of my previous miscarriage, I am a bit paranoid, therefore I go for the beta HCG bloodtest every two days. Here are my levels:

18/02 - 45

20/02 - 145

22/02 - 391

25/02 - 2063

It trippled nicely for the first three blooddraws. The last one showed a massive jump, five times more than the level three days ago. Is this normal?

I am just happy that little sprinkle is settling in nicely. Just curious as to the recent massive jump! Any thoughts?