could I be pregnant?

Over spring break (almost 2 weeks ago) my boyfriend and I had sex everyday multiple times a day. I was ovulating and didn't realize til afterward. I had a very crazy period before I got on birth control but when I was on birth control it was always the exact same day every month. I didn't like what the pill did to me so I switched (wasn't on anything over spring break, just rellied on pull out) but I can't start the nueva ring until after my period which I haven't got and is 8 days late. I don't ever get sick but this past week I've throwing up everyday and been super tired, I took a pregnancy test about a week ago and it was negative. Could it have been to early to tell? My body feels really off, I'm kind of scared I need advice guys.