Not sure if I was spotting or had my period

So I had sex on March 12, and the condom broke. I’ve recently come off birth control for a number of reasons that I won’t get into. I took plan b within a few hours. Then my period was 4 days late. And it only lasted 3 days, when i usually have 5-7 days of bleeding. I’ve heard only bleeding for 3 days can be spotting, it it seemed like my usual amount of blood. Thoughts?