Pinkish Discharge to Milky White: Pregnancy?

From the beta hcg values, it appears that you are not currently pregnant. Irregular periods are often symptoms of other medical conditions. You should consult a gynecologist in order to review and diagnose. They can recommend you proper medical advice and treatment regarding your condition.

Its not recommended to undergo hair perming or coloring during pregnancy or while breastfeeding as the chemicals used in these treatments can be harmful to the baby. Moreover the safety of metronidazole while breastfeeding is not clear, as the medication can be excreted in breast milk and may cause side effects in the baby. 

During ovulation, even with protected sex, there's a chance of getting pregnant if ejaculation occurs inside. Signs of pregnancy include a missed period, fatigue, nausea, and breast tenderness. The only way to confirm pregnancy is by taking a test. If you don't plan on having a baby, always use protection. If you suspect you're pregnant, take a test to be sure.

Plan B is most effective when used as soon as possible after unprotected sex — preferably within 72 hours. It prevents pregnancy by postponing ovulation. However, it is essential to remember that it is not 100% effective. If you miss your period or notice any unusual symptoms, make sure to take a pregnancy test. 

The doctor ordered this radiological test to check for any abnormalities, such as polyps or cancer, which might be causing post-menopausal bleeding. Endometrial hyperplasia, a condition where the uterine lining becomes thickened, may or may not involve atypical (abnormal) cells. If MRI and TVS reports show no pathological abnormalities, progesterone therapy may be recommended as a non-surgical treatment option. 

It is impossible to diagnose your pregnancy under the circumstances without a pregnancy test and a checkup. A gynaecologist specialises in women's reproductive health and can provide the proper medical advice and treatment.