My girlfriend usually have a 30 days cycle we had sex on the 33rd day of her cycle which is already late when we had protected condom, today is the 7th day of her late period; still didn't came. how many days before we should go test for a pregnant?

Now is an appropriate time to take a HPT. Although hCH levels will vary from woman to woman at this time, one week after a missed period is usually the earliest that these tests will work accurately.

A late or scant period is possible indication of condom-contraception and pregnancy I would suggest an immediate pregnancy test. A negative test in the presence of amenorrhea (lack of a period) is best resolved by an evaluation by a trusted ob-gyn.