tighter cervix could that be a sign if pregnant?

Hello ,

I had my period on the 4th as i already said on my other post which it was a weird on this time i bleed for two days and then the third day it was light and sorta pinkish orange but the 4 day it was brown when i took the tampon out , so i still dont know if im pregnant or not im waiting for another week but yesterday my boyfriend and i had unprotected sex and he said it felt tighter this time , could that be a sign