Am I pregnant??

Alex
On March 12th, I started what I thought was my period. It was light spotting and lasted 7 days. Normally my periods are quite heavy that I bleed through an ultra absorbent tampon in a couple of hours and I will always bleed through any sort of absorbent at night, and last only about 4 days. 
So on the 7th day i took a Safeway brand pregnancy test which came back with a faint positive without FMU, so the next day I took another one of the same brand that came back still faint but a little darker and just as thick as control line and when tweaked it's the same color too. 
I have symptoms like swollen breasts and they're a little sore when touched. 
Nauseated every day, certain smells make me want to throw up but I never do. 
More tired than I have been. 
Slight headaches that are worse some days than others. 
I've been having slight cramps the last couple of days which im attributing to the back aches I've had since Saturday. 
What do you ladies think? 
Anyone experienced this before?!