Boob Question

Lately, my boobs have been feeling different. They feel a lot bigger but when I look at them in the mirror they look almost the same size as before. They feel different too. Usually my boobs are firm but they’ve been feeling ‘squishy’. They don’t feel sore and they aren’t tender. I’m an 18 years old and I’m worried maybe it’s a sign of pregnancy. Usually after I ovulate my boobs start to get sore and start to hurt. My period should start in 10 days but im worried because if I got pregnant it would mess up my college.

Am I just paranoid that I might be pregnant?

If someone could just give me a little advice on how boobs work and how they can change I would appreciate it..