Overdue

If you've had your blood drawn and it's negative, I'd think you're not pregnant—though there are always exceptions. It could also be that you just have a much longer cycle this time and still need to get your period. Sometimes, due to stress or other factors, ovulation can be later, which means your period will also come later. It's a matter of waiting now or maybe doing an early pregnancy test to get a bit more clarity.

Negative blood test? I've never heard of being pregnant with a negative result unless you're only 3 weeks pregnant, so that's really early! If you still haven't gotten your period in 14 days, I'd get another blood test. But as Bibi said, you can suddenly be late for a while due to all sorts of things. Later on, you might figure out what caused it (new job, stress, etc.). Good luck while you wait!