when to test?

Sh

Hi ladies!! I got my periods on 11 mar 2018. My avg cycle is 26. I had sharp pains on my right bottom abdomen on 20th mar. i thought i was ovulating. From 24th i was having sharp cramps in the same place (right abdomen). It stopped yesterday. I had back pain on 24th. No spotting. No CM. I never miss to get periods in 26 days. My due date for next periods is Apr 1 or Apr 2. When can i test? tomorrow?