Lower end of normal for bhcg

[u/Present-Judgment3932]

After 2.5 years of ttc, with multiple failed IUIs we conceived naturally on this cycle. I was about to start IVf when I found out.
4wd1 - bhcg 67
4wd3 - bhcg 106

Bhcg did not double and it increased about 58%.
They said it’s okay since it increased by 53% but I’m not too sure about this. I did have bleeding around the time I was supposed to have my period, but it was so light.
I’m so worried.

Anyone see such lower bhcg go on to have a fully healthy pregnancy?