What Causes Delayed Menstruation Along With Bloating And Constipation?

Hi, so I am four days late with my menstrual cycle. I am nauseous, shaky, slightly bloated, constipated, and I was a bit feverish. I haven t had sex since February 27th but he pulled out before he ejaculated. I haven t taken a pregnancy test, but I was curious if there is a chance I am pregnant.