When to test for pregnancy?

Hi all, I'm a 26 year old married female who is not trying to have a baby, although if one happened it would be ok. Alright here is my question....I have not missed any periods, and have no tenderness of the boobs however I have been fairly nauseous for the past week or two and have had a lot of indigestion/acid reflux. I have also been feeling just kinda off, kinda dizzy or light headed. I'm on birth control so I really have no reason to think I'm pregnant aside from the overall ookieness. When or should I test? Should this even be a concern for me?