Does birth control mimic pregnancy symptoms?

I'm new to the whole bc. I did have unprotected sex and started the pill 3 days after including morning after pill but It was wierd.  the first week that I started I felt depressed, fatigued I was also spotting I also had gotten a rash on my neck and was getting wierd food cravings and backaches and felt itchy on my back and grew pimples on my back something that never happens and when I would shave my legs they got so irritated. Are these bc side effects affects does birth control mimic pregnancy?