What were your hcg levels at 4 weeks?

Heather
At 15dpo it was 96 and at 17dpo it was  221. I know they say all that matters is that they double but I am still worried because they seem kinda low to me. I had miscarriage 5 months ago and I had problems with low hcg and them not doubling in the 6th week so I need some reassurance! Thanks in advance!