) Increase in CM is normal in early pregnancy
. Totally possible if you had unprotected sex, but all of this can also mean your period's about to start. Never had butterflies that early myself, but definitely had the killer boobs and extra goo with every suspected pregnancy. My breasts were noticeably bigger within a week!
Light bleeding/spotting that seems different from your period over the next couple days is a potential tipoff that something might be up.