Could I be pregnant?!?!

Last period was sept 17-21. It was heavy and miserable on the first day( like the worst pain and so heavy). Then it started to get lighter and lighter. I usually bleed for 7-8 days this was about 4.5 days. I started to feel a little nauseous and bleh so I took a Prego test after having the period. It came back negative! :( I am ovulating(according to glow) and have been feeling off and on nauseous, my stomach feels "bubbly" and I am having CM. my CM is heavy and almost stringy elastic.... Tell me what you think?!?! I feel like I'm pestering my husband with what he thinks! Haha