I've recently had sex on my highly fertile dates while ovulating. Recently the dog in the house who usually follows my mom everywhere and hardly stays in my room with me has been up under my butt 24/7! I've read that animals usually sense pregnancy early. The dog sleeps in the bed with my boyfriend and I and even when my mom calls her she won't budge (which is very unusual) I've also been having a lot of chest pains (mainly when I swallow food or drink) it goes straight down the middle of my chest and hurts extremely bad. I've been eating a lot regardless of how painful it is. I haven't taken a pregnancy test because I'm nervous to buy one just to get my period and have my hopes let down. My next expected period is in about a week. Any advice?