Flipping cycles are messed up!

Okay so me and my partner have been trying to conceive for 7 months, we haven't been overly trying but we haven't been stopping it either. I have fell pregnant 3 times before when i was younger and all have miscarried. I follow my period on this app and every month my period is late.. it was at the 1st on the month for a few months then I was two weeks late and now I'm a week later than that now. This is so frustrating