Pregnant???

So I’m on my break week. I usually get my period around the 2nd day. I didn’t get any bleeding until the 4th day very late in the day. It lasted probably like 3 hours and was hardly anything. I had a tampon in and it didn’t even absorb half of it. Since then I haven’t had any bleeding at all. It’s day 7. I’m not sure if it could’ve been implantation bleeding or something. My boobs were sore on the same day I bled but only lasted that day. I have been emotional lately as well.