All Confused

They say when a woman's pregnant, she just "knows." Call it woman's intuition, call it whatever you want but it's been known to happen. It worked for my grandma, my mom, and my sister. They just knew they were pregnant and then took a test. It was positive. Now, enter me: I feel like I am. I totally believe that I am but when I took one test, positive, and then another, negative. How often does that mean someone is pregnant?

I'm just so confused. I want to be pregnant so bad. I want to have a baby but it seems like I can't get pregnant and then this crap happens.