TTC for first - so frustrated.

​So we've been TTC for 3 months (not long I know). I've been using glow to track my periods because I've had an IUD for 4 years and never had a period with that. My first cycle was 28 days. My second was 35 days. So I figured everything was being adjusted by glow which was done and I wasn't expecting my next period until January 11th. Apparently it decided to start today which totally changes all of my fertility days. I feel so frustrated. Because my cycle is all over the place I can't even get my fertility days right. I just wanna cry!