Had a history of hormonal imbalance, used pills for 6mos, last period was oct4 had unprotected sex last oct18,28 nov8,11 still no period hpt(-) twice?

Imbalance: The delayed period is probably due to the hormone imbalance. Talk to your doctor about treatment options since they differ depending on you desires regarding pregnancy. Best wishes.

Late period: Reasons for missed/late periods: low body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems (i.e. PCOS). #1 reason is pregnancy.