When urine begins to smell like ammonia, it usually means one of two things. First, it could be that you are a bit dehydrated and therefore your urine is more concentrated. All urine has ammonia which is a normal product of the metabolism of protein. Thus, all your urine should smell a little bit like ammonia, and this smell is enhanced by the urine being more concentrated. Sometimes urine smells stronger when there has been a change in your diet. Some people that go on the so-called high protein diet in attempts to lose weight will have a change in the way their urine smells (more ammonia-like). Another possibility is that your urine is infected with a bacteria. Some bacteria can feed on different compounds in the urine making it smell quite bad. I don't think that the smell of you urine has anything to do with you recently starting your menstrual cycle.
I suggest that you schedule an appointment with your primary care physician
. The usual protocol when someone comes into my office and complains of anything to do with their urine is to perform a simple urinalysis. This is a quick test that will let your doctor
know if you have a urinary tract infection
, and may reveal why your urine smells different.