It is common for periods to be delayed after pregnancy especially if you are still breast feeding or have recently stopped breast feeding. Prolactin is a hormone secreted by the pituitary gland in response to an infant’s suckling and its primary purpose is to stimulate breast milk production. As a side effect, prolactin inhibits sex hormones and is responsible for increasing irregularity or a complete loss of menstrual periods.
Another factor that may be contributing to your loss of menstrual periods is the recent move from Dubai to India. Stress is a major factor that can inhibit ovulation and menstruation.
Given that your pregnancy tests have been negative, it is unlikely that you are pregnant. In addition, you have had menstrual bleeding so a serious disorder with your pituitary gland is unlikely. If you are breast feeding, your periods should return to normal in a few months after you stop. If you continue to have menstrual irregularity in the coming months or cease to have periods, you should seek medical attention.