Why don't my boobs hurt? :/

Sienna ❄️ • 29 years old, trying with hubby for #1. 1st & 2nd pregnancies were ectopic. FET #1 failed.
I'm 5 weeks along and I know it seems strange to be upset about my boob not hurting but I feel like pretty much everyone I've seen so far has sore boobs early on in pregnancy. Why don't mine hurt? :/