In general, the woman who uses contraceptive the monthly bleeding is reduced or even absence of menstruation. This is a normal situation and there is no need for more worries if you do suitable use contraceptive.
This absence of menstruation or reduction of the menstrual flow happens because the hormone contraception tries to mimic a woman's menstrual cycle, but in a way that ovulation does not occur and, consequently, pregnancy. In this way, the inner layer of the uterus (endometrium) is constantly slim and often there is nothing to floss and in these cases menstruation does not occur.
If you take contraceptive correctly and there was no flaw in the method, such as tablet forgetfulness or delay to take the injection, you can continue with the contraceptive. If there has been a failure in use during this time, it is important to wait a few weeks and perform a pregnancy test.
I take contraceptive and menstruation did not come I can be pregnant?