Could I be pregnant- would be about 8 weeks

I've been on birthcontrol for 7 years and never had a problem. 8 nights ago I got real dizzy and threw up. I've had non stop nausea for over 3 straight days. my breasts have never really been uncomfortable except when running (which I never do) but recently I'll feel some slight aches in them. I've lost about 4 pounds in the past week because food isn't appealing except toast and pasta nothing with much flavor. I went to the doctor and they said the pee test was negative but they also mentioned there was blood in it. I've been feeling really wet which usually only happens when i'm on my sugar pills which are a week and a half away. Last period I forgot to put a tampon in a few times and never had any problem. my temp is also 99.5 If anyone can give me some advice, I feel like I have too many symptoms for a negative