Advice/Help

So I made a post yesterday and only got a little taste of an answer to my question lol. I am supposed to be on cycle day 7 of my period and I haven't bled really at all the past 7 days. I had super sore boobs like the first 3-4 days of my supposed to be period and today I've been super hot then super cold off and on plus I got super nauseous after getting out of the shower. The shower wasn't even super hot either. I'm confused and want to know if this sounds like stress or if it sounds like in pregnant? I've also been suppperrr emotional and just angry the past week or so and pretty moody. What does this sound like to you ladies? And should I take a test? If so how long should I wait to take one after my missed period?