In need of some advice.

My man and I have been TTC for over a year now. I've had late periods where I thought I might be pregnant but it was only late (no other symptoms). So this month it's late too, but I've been "sick" a couple times and nauseous until I get "sick". It wasn't every day but the last 4 days it seems like it is every day. I took a test on the first day of my missed period and it was negative.