Is my period changing???

Almost 4 years ago i got on the depo shot my periods before were heavy and painful and usually lasted 7 days. After two years on the shot I switched to the pill and had a “normal” period. The pills I took gave me a period once every three months but I quit taking them after 6moths or so.

After being off my birth control my period only lasted 4-5 days but I’ve noticed that this month my period has lasted 7 days. I thought that my 4 day period was great and after 8 months of not being on any form of birth control my period was fine. Does this mean that I might have a better chance conceiving now that my period is going back to how it was almost 4 years ago????