Regarding having no idea when one's last period was, since some responses have brought up the subject, I'd just like to say that some girls and women have situations in their lives that really mean that it's difficult to either recall the last period, or to say with certainty if that was actually a period or not.
My daughter is in her 20s, but with her dysautonomia, and has many medical issues (which are 99% in the so-called "invisible" category, meaning that to the casual observer, she appears healthy, when in reality she is dealing with several very debilitating medical diagnoses). She has never had regularity and sometimes has had just a couple of periods per year, and sometimes she's had 18 per year, and some have lasted 30 days and some have lasted 30 minutes. She's extremely intelligent, but when asked, at medical appointments, when her last period was, she really struggles to answer with any sort of time frame. Was that a period or not? It only lasted a couple of hours. When was that? Last, um, February? or March? Do you call a period that lasts 35 days a period or a medical event? And with so many other things going on, it's hard to keep track of.
She's not sexually active at all, and takes birth control to try to get some sort of regulation (it has helped) but I just wanted to say that some women do have a hard time answering what would seem to be a simple question for most of us. Yes, a calendar can help.
I agree, the ER isn't the place for you, unless you're trying to tell us that by "symptoms" you mean unrelenting pain, extreme bleeding, or vomiting that is preventing you from eating or drinking anything. If you mean symptoms like a little morning sickness, suddenly craving pickles at midnight, and not fitting into your skinniest jeans all of a sudden, then you need to see an ob/gyn. You'll need prenatal vitamins and good prenatal care.