Could I still be pregnant?

Hi guys!
I'm about 2 weeks late and I took 2 pregnancy tests last week, both negative. 
I've been exhausted lately. I never nap and I've been napping constantly throughout the day. I feel like I never have energy. 
My sense of smell has been through the roof. My husband says he doesn't understand what I'm smelling because he doesn't smell it. 
I've been nauseous on and off and so moody it's nuts. I keep joking that my period is going to come because of the mood swings... But nothing happens. 
Is it possible I could actually be pregnant and maybe I ovulated later in my cycle than I thought? I don't want to keep wasting money on tests.