never have spotted before, also been bloaded and nauseated

Hi, and thanks for your medical question on eHealth forum!

Spotting a week before the periods can be due to implantation bleed. If you had unprotected sex, then either wait until 12th, and if you miss periods, take a test and see. Otherwise, you can also take blood HCG test about 3-4 days before periods. If pregnancy is ruled out, please consult a gynecologist.

There are many other causes of spotting between periods such as hypothyroidism, cervical dysplasia, cervical polyps, cervicitis (infection/inflammation of cervix), vaginitis (infection/inflammation of vagina), cervical and uterine cancer, uterine fibroids, hormonal imbalance as in polycystic disease of the ovary, use of blood thinners, genital ulcers, STDs and stress.

I think you should discuss these possibilities with your gynecologist. A comprehensive investigation is required keeping all the points in mind. Hope this helps. Take care!