Okay this is gonna be super long! But please read! :)

Okay... I had a d&c in August & my periods have been irregular. We just recently started trying again & I have been trying to chart out my cycles. My 1st period after the miscarriage was September 26-29 & the 2nd period was October 10-12. I have no idea when I ovulated but I did have some egg white discharge on October 30th & some spotting. At first I thought it was implantation bleeding but now I am starting to believe it was ovulation spotting. But that means that I would be late at ovulating.. means I ovulated on day 21 on my cycle. But I used to think my cycles were 28 days long. BUT I'm starting to think my cycles are actually longer! Because before I had the miscarriage, I thought I was farther along going by a 28 day cycle. But once I had an ultrasound I wasn't as far along as I thought I was. Looking back on the calender, since I wasn't as far along, that means I ovulated around the 21st day of my cycle. Does this sound right?? Could my cycles actually be longer now?? & don't tell me to wait for pregnancy test yada yada ya. I just want to know if it's possible that my cycles are longer than the 28 days that I thought they were. Lol Because since we have been trying I have bought a ton of tests & they're showing up negative but if my cycles are longer than I am testing way too early. Thanks in advance! Any advice or personal experiences are welcome! :)