Periods getting shorter each cycle ttc

Maddie

Hey yall we have been TTC for about 7 months now & nothing. But I have started noticing that the past few periods have gotten shorter. It started at about 6/5 days and then it went down to bleeding for 3 days. But my last period I was only bleeding for a day! And it was only light bleeding! I was spotting for 2 days after but that’s it. What could this mean?? Is something wrong? Have y’all had any experience with this?