could I really be pregnant?

Kendra
I've only been off my birth control for a couple weeks and taking prenatal as prescribed. My husband thinks I'm pregnant because of little symptoms. I asked my dr about this. She said the soonest I could've got pregnant was the 23rd, however we did the deed on the 21st. I know sperm can stay alive for up to 5 days. 
Could I really be pregnant right now?