Ttc #1 & missed period. Help!

Miranda

So i have 26 day cycles. November I had a period from the 19-22nd

December it came 15-19th and we had sex on my fertile days. But also had a second one that month on day after my normal period. Fast forward to this month and no period???? When Should I test?? Not much symptoms just diarrhea & sharp pains and sometimes it feels a little crampy. Someone please help!!!