Starting to wonder

So I'm not entirely sure if I am pregnant or not I am thinking I might be.. I have PCOS so my cycles are very screwed up. I have a doctors appointment on the 1st. Anyways I have never been one to throw up when ever I have an upset stomach it always tmi comes out the other end. I can feel like I'm gonna throw up for hours even try to make it happen with no luck only to end up sitting on the toilet for a while. Anyways the last week or so I have been feeling very off I've been feeling nauseous and like I need to throw up but I never can. I have been having pouts of lose stools instead and they are definitely accompanied by nausea. At first I thought I had caught a bug or something but it has been going on since last week. I just ate dinner and after I finished I immediately felt nauseous like I was gonna throw up.. I can only hope. I guess my question is could "morning sickness" be in this form also? I have other "symptoms" too so that's how I know I am not sick with the flu or anything.