Bleeding in light pink

hi, my name is sonia. Im kind of in the same boat as you except my boyfriend and i are not trying to conceive.
my last period started on tuesday the 13th. and it ended on sunday the 18th. my boyfriend and i have had mostly protected sex since then every night. (by mostly i mean well start off without a condom and well stop and he will put one on.)
Well last night, the 19th technically the 20th. we had sex two times. i went to the bathroom after to "clean up(?)" and i realized when i wiped there was a faint pink color. it was like a mucus like you know- normal-... but it was very thin, and a DEFINATE pink color to it. i cant even really say tint because it was that pink. definitely not period blood right? my period lasted longer than normal also. normally its two days long. im scared that i might be pregnant... i cant afford a test right now, yes i know they are pretty cheap but we just moved into an apartment! i also smoke cigaretts, ive smoked for years, and now i cant even finish a whole cigarette. i take two or three hits off of it and i have to give it to my boyfriend to finish. i have sort of a vomit taste and then i need a drink not to th row up. Im scared and could really use some help!