Hcg levels

Erin

Hi everyone, just wanted some opinions. I have had two blood tests to measure my levels on 12/17/21 they were at 22 mIU/mL on 12/22/21 they were at 28 mIU/mL. Should I be concerned since it isn't doubling every 48-72 hours only went up by

6 mIU/mL in 5 days. Please let me know your thoughts or if you have experienced this.