Maybe pregnant?

Could I be pregnant? I'm only on cycle day 20 so I know it's early but (TMI) I'm having brown discharge and I have to pee all the time and having some cramps. Also I'm getting tired way before I usually go to bed I feel bloated and I usually don't and last night I was eating my favourite meal and all I wanted to do was puke. Since then I feel nauseous a lot. I'm not actively trying to get pregnant I'm just wondering if I could be or if it's something else.