???plz HELP

Ashley • Ik we`ve only been ttc for one month but I`m praying this is our month :)
I got had a period in April 11th got off BC on April 21st and had my period may 15th... JUST GOT OUT of MY FERTILITY WINDOW ON THE 6th and we BD everyday during it
​Glow says I'm not due for a period until the 18th
​But I'm having weird cramp like pains????should I be expecting a period on the 12th