When should my period be?

Dr
Ok so glow thinks my period is in two days because I had a short cycle last month, but I only had an early period that last four days (unusual for me) because I got my mirena removed the day before it started. 
So when should my period be? I think my hubby and I conceived when I ovulated two days after my period ended, so I don't know when "missing my period" is, and therefore I don't know when to test. :/ help!