Period a week late and unsure of what to do

So I was supposed to get my period a week ago and I've had problems with my period in the past due to medicine that I was on. It has been coming ever month normally since September. I keep having some what cramping but no sign of my period as of yet. Sometimes I also get abdominal pain that makes me feel nauseous and today I've had a hormonal headache that even with taking Advil has not gone away. I am probably overreacting but I am not sure if this time something could have actually be not a false alarm. I am not on the pill and he pulls out every time and I know even then things happen but I am not sure if I should take the test or not. Is there a chance I could be pregnant?