What do you think?

A
I've been having what I believe to be pregnancy symptoms for about a week now. 
I've had; 
Quite bad nausea, with the worst being yesterday morning. But this eases off during the afternoon. 
Friday I just ate all day. I never eat that much food.
Today I am so thirsty (had this on Friday too). Nothing quenches my thirst. 
Sore and heavy boobs. They're getting so uncomfy that it wakes me up during the night. 
I've been feeling lightheaded and dizzy. This has been quiet bad today. Considering I spend my working day sat at a desk and today I got some lucozade to try and help in case it was my blood sugar levels causing the issue and it hasn't helped at all.
Had cramps yesterday. They were more noticeable for a couple of hours during the afternoon. They aren't like my normal AF cramps either. As my AF cramps are a constant ache and these cramps are more of a pinching sensation.
I've also gone off of chocolate today! That never happens. 
 
I've added my chart from Glo so you can see.
Anyone else get this? Could I be pregnant?