Wrong due date?

Kiamon3 • 12.5.17💙👩‍👦👑

So in March I had a “period” that was extremely light (could get by with a single panty liner per day) with little to no cramping that only lasted 3 days. In April I found out I was pregnant. On my first official appointment they asked me when my last period was and me being unaware of what the little incident in March was I gave that date which in turn gave me the due date of dec 18. Since then. I’ve been told that my Son is ahead of the average baby at the same amount of weeks gestational. He’s been head down since 21 Weeks and I officially started having actually contractions and dilating at 31 Weeks. I’m a first time mom btw.

So I was just curious if it was possible that my due date is actually wrong and that the incident in March was implantation instead of a period And if this possibly explains why I’m experiencing real labor so early.

Thanks in advance