Subchorionic hematoma

So I am exactly 19 weeks today, due December 31st.. I also have a subchorionic hematoma, I didn’t know I was pregnant bc I THOUGHT I got my period April 23rd which lasted 7 days (normal for me) stopped for two & started for two more (not normal for me) obviously this couldn’t have been my period bc I’m 19 weeks.. so could it have been my hematoma at the time?