Your opinions if this could be pregnancy

I'm only 3 days late so I don't even know if i should have any symptoms according to pregancy calculator I would be about 4 wks 5 days pregnant..and for the record I took a hpt on the day of my missed period and it was negative...But anyways on to the symptoms, I am always tired but been feeling completely exhausted here lately.. I can sleep 13hrs and still be so tired..had some back pain but that may be due to somehow pullin my back out and just as my back was feelin better I woke up with a stiff neck..I've been feeling nauseous on and off and the same with cramps.. Today I ate a cheesburger and then felt kinda sick afterwards,this may be a lil TMI but I've also had some clear watery oderless discharge like sometime I feel like I started my period ..also off and on I feel like a tightness or even at sometimes a full feeling in my belly..my breast were really sore yesterday and then it kinda faded today until this evening an then they started hurtin again..also I don't know if this is something but I physically feel hit sometimes , I think that's about it... so what do u think Lol, I'll be testing again in 4 days:) wish me luck and baby dust plz