Kind of confused..

So I was supposed to get my period this past Wednesday and I have still had nothing. Instead I've had crappy headaches which I never get, some crappy nausea in the beginning of the week but no actual vomit and now I'm bloated like crap and constipated. I was silly and took a PT on the first day my period was supposed to come and it was negative. I don't have sore breasts and I had like light period like cramps from Wednesday to Friday. Not sure if I'm overreacting but google is freaking me out too. Are these early signs of pregnancy or am I just jumping the gun? Answers would be greatly appreciated!