It is possible for women on certain types of contraceptives to experience lighter or no bleeding during their menstrual cycle. However, if you are concerned about the possibility of being pregnant, it is always a good idea to take a pregnancy test to confirm. If the test is negative, there is likely no need for further worry. It is also worth noting that certain factors such as PCOS or the hormone levels in your contraceptive could also play a role in changes to your menstrual cycle.