I have all the pregnancy symptoms and unusual periods, could i be pregnant?

Hi, I have been getting every pregnancy symptom I have ever heard of or looked up, but i still get my period. Usually my period lasts 5 days but lately it only lasts 2. I know a lot of pregnancy symptoms can also just be your period but I have never had anything like that before. Also, between my last 2 periods I have had some very very light bleeding and bad cramps. I have made an appointment with my doctor but it isnt for another 3 weeks, I'm curious to know if anyone has experienced anything like this? i know it may sound silly but i know my body and something isnt right..