Struggling With Getting Pregnant

This is my second full month of using Glow to track ovulation. Before using this, I’ve always known I had irregular periods and have been on birth control the last few months (up until April 2019) to regulate my periods. Seeing it makes it a little more difficult because I can’t believe my period is kind of all over the place once AGAIN. But...I’m 4 days late this month and I’m thinking because I had such a long period last month. Soooo hard....any suggestions/advice?!