Heaviness??

Amy • Pregnant with baby #1. Married since 9/7/2008 to my high school sweetheart. Together for 14 years!
I'm 8 dpo and waiting to take a test. I've been having this heavy stretching feeling in my abdomen. Anyone experience this? I've been trying for a while and refuse to take a test this early (actually my husband won't let me buy any lol) any ideas of why I might be feeling this??