Thank you for your query.
There is one very easy way to know if you are pregnant.
As your proper period was due a week back, you can take a home urine pregnancy
test tomorrow morning and know if there is a pregnancy.
There is a definite possibility as you had unprotected sex.
Regarding the pink discharge, it could be an altered period pattern, a miscarriage
or an ectopic pregnancy.
A foul smelling vaginal discharge
also indicates the possibility of a pelvic infection
or a miscarriage.
You would know once you take the pregnancy test.
Please follow up with that.