After taking two doses of postinor 2 in the same week, i got my period., after my period, there has been yellow watery discharge with no odor or itch?

Infection: A yellow watery discharge could be a sign of an infection. If you took emergency contraception twice in one week, you must be having unprotected intercourse and pregnancy is not the only risk with that but it is the only one decreased by postinor. You need to be tested and that would also be a good time to start a more reliable method of contraception. Be safe.