Ob-Gyn questions? Ask a gynecologist online.
Hello, I'm Dr Manos, board certified obgyn. I retired from forty years of practicing obgyn last year and being an expert for Justanswer has had me answering the same questions I did for all the years. I delivered around 10000 babies and in all that time I recall one patient that delivered after age 45. There were about three maybe four patients that were over 46 that conceived and each miscarried. What I'm saying is that you're not likely to be pregnant. At your age, you don't ovulate much anymore and when you do it's like the kernels at the bottom of a popcorn box that never popped well. Taking plan B, which is a potent progesterone derivative, will throw you off any predictability. When the effects of the pill wear off, you will get cramps and bleeding because your uterine lining might have been getting thicker over the last six months and the pill will actually help shrink the lining with heavy bleeding and cramps. It should only last three or four days and you should be ok. I know this is a lot of information but it is basic female reproductive cycling and predictable. You might consult an obgyn but wait for now when you probably cramp and flow later in the week or next week.
Nausea is the most common side effect and can last as long as a week as it varies with the woman's metabolism. The cramps happen as the level of the drug decreases.