Hello. Welcome to Healthcare Magic. Although it s always a little concerning when your usual menstrual pattern gets disrupted, this situation doesn t necessarily mean you have a serious underlying problem, and if you haven t had any condom failures, it s unlikely you re pregnant. However, since there s no way to be 100% certain that a condom didn t have a defect, it s reasonable to take a home pregnancy test. (By the way, if you ve miscarried your HCG level may not be high enough to trigger a home pregnancy test.) Presuming the test is negative, there are a number of factors that can cause irregular periods, including ovarian cysts, thyroid disease, severe stress, illness, endometriosis, a significant change in activity level or body weight, obesity and certain medications or recreational drugs. In most cases, menstrual irregularities are transient, and the majority of women who experience such episodes resume their normal pattern within a cycle or two. If you re not having any other symptoms (pelvic pain, fever, chills, breast tenderness, severe headaches, nausea, etc.), you may just want to watch things for another cycle to see if your bleeding settles down. If you are having other problems -- or if your irregular bleeding persists -- see your GYN for an evaluation. I hope that helps!