I transferred $20 into my blockchain account and now it says “may be at risked for a double spend” what do I do?
If I understand your problem correctly I think you can send money without any error. Try doing it now.
The problem is that you sent several transactions in a short time "previous transactions were not confirmed."
Next time you have to wait until 1 confirms.
I also advise you to use Electrum as an alternative to your "blockchain account."