Short periods after birth control

I stopped birth control about 6 months ago. I've always had relatively short periods- 4 days average before I started bc. While on bc, they were very short, or sometimes I skipped them altogether. Since stopping, they last about 48 hours. It makes me worried that my lining isn't thick enough for implantation to happen. I had a chemical pregnancy in feb- which of course feeds into this idea even though I know they are really common. I just wish I had longer periods! I know that is kind of a funny thing to wish for :)