Positive test but worried!

Manal • Soon to be a mommy of 3 under 3
Hello there..
​I been testing for 2 days & all my tests  are positive YaY!!! 
On clearblue,clinical guard & wondfo.
​& this is my calendar 
 
​but my concern is that my HCG level is only 24.36 mIU/ml 
​I read online that anything under 25 is  not a confirmed pregnancy?!
​Could my levels be so low because it's earlier than my AF? I was supposed to get it on the 3rd of May..I'm just worried now..should my levels be higher?