Missed period and sickness- HELP

So I have 34 day cycles. I'm now 2 days late on my period. I had a little bit of stomach pain yesterday but didn't feel like major period pain like I usually get when due on. I was sick a few days ago and today I feel terrible. Feeling a little Dizzy and been sick twice. If I was pregnant would I be being sick this early from pregnancy? Took a pregnancy test a week ago and it was negative but now I'm two days late I'm too scared to take a test as I don't want it to say negative again!