Not sure

I've not had a period since July 26th and am not sure if i should take a test or not. I just now really noticed that I've not had my period for like 2 month almost and am usually on a 25-31 day schedule. And yes me and my husband are trying for baby number 3 but with my age and health issues am not sure if its going to happen. I have thyroid issues that interfere with my cycle every month by like a day or two but nothing like this. So my question is should i take a test or not.