Just found out I am pregnant, but my hcg levels are...

Brittney

28 mIU/mL

From the first day of my last mental cycle I should be around 5 weeks and 2 days if I ovulated on time (I'm not very sure if I did or not) but has anyone had levels this low? I am having total anxiety over here, and they can't re draw my hcg again until tuesday to see if it's going up.