If you suspect there is a high chance of pregnancy, I would suggest repeating the urine pregnancy test in a week’s time. If it still negative then it is unlikely you are pregnant.
Irregular bleeding like what you describe is not uncommon in PCOS even in the absence of pregnancy.
I would recommend using contraception if you are sexually active.
In addition to preventing pregnancy, contraception like the oral contraceptive pill (OCP) will make your periods regular and light, and prevent endometrial hyperplasia (build up of womb lining) which is very common in PCOS.
The contraceptive pill will improve some of the other symptoms of PCOS like hirsutism or acne.
An alternative to the OCP would be the levonorgestrel releasing intrauterine device (Mirena), which:
- Prevents pregnancy,
- Prevents the development of endometrial hyperplasia
- Reduces menstrual irregularity commonly seen in PCOS
