What is going on?

My husband and I have been ttc for about 3 months now. We already have one child that just turned 3 this month. Lately my entire body is in pain!!! Sharp pain in my boobs, peeing constantly, off and on hard stomach, sleeping and eating EVER chance I get... However I start in 4 days. And these are NOT normal period symptoms. I took a test and it turned negative in seconds. What's wrong with me?????