Help???

Teri • I`m 18 and I have a handsome 1year old boy. I`m getting married June 19, 2015!!!!
My son was in his playroom and I'm in the front room, and he had a poopy diaper.... My fiancé and I have been trying for another baby..... I haven't taken a test, but I've been having really strong sense of smell because I can never smell his butt.... But I could smell it that far away???? Could I be pregnant? I've been having horrible headaches, sleeping a lot, and really strong smell..... Need help!!!!