Hoping & praying for a positive!

Started AF October 29th to November 3rd then a week later had another period that lasted for 4 days. On the way hunting Saturday morning I got real nauseous, hot flashes, light headed, dizzy and a headache! It was on and off all day. I pretty much finished hunting and slept the day away and slept good that night! It's Monday night and I still have a headache. I took a pregnancy test and it was negative! Not sure if it's too soon to tell or if I'm just not pregant! Has this happened to anyone else and they were actually pregnant?