Feeling off

I haven't been feeling very good lately. I have been feeling very sick to my stomach, dizzy, and very very slight cramps. However, af showed up 11dpo and it was light pink but it was enough to fill a tampon but only lasted for 2 days. I also had bad cramps with it. I've started working out a lot lately to get back into shape. Could that be why I don't feel well or should I take a test to be sure?