Okay.. i had unprotected intercourse. n now my period is watery instead of thick. d blood is dark red. does that mean i am pregant. n is that possibl?

Hard to say.: Have you missed a period? Are you breasts unusually tender? Do you have "flu" like symptoms. Do you have a feeling of pelvic fullness? Do you have nausea? Best way to know is to do a pregnancy test at home or if see your pcp or gyn and discuss. Menses can be different and you not be pregnant. The reverse is true too! just do a test! be sure and be safe. (watch out for the unprotected sex).