Longer Periods

Does anyone have an idea what could be wrong?

Every month my cycle changes and it does worry me I am going to see my gynecologist in two weeks. But at first my cycle started out normal (I had my baby 10/3/20) and my first cycle was Near the end of November. I’m not really sure what’s going on every month my cycles get longer and longer. I thought I was pregnant and tested a week ago and it was two faint positives FRER. But I tested yesterday and it was negative (bummers 😕) but also when I have sex sometimes I spot a little afterwards and that’s not something I would normally see after sex. I posted my cycle log below, and thanks for helping! (The purple dots are the days I spotted one time during the day)