Period or something else? HELP 😔

My boyfriend and I had PROTECTED sex on March 4th (6 days after my period for February ended). I was afraid that something went wrong with the condom, he swore nothing did, so I took Plan B just to be on the safe side. I took it 2 hours after the "incident". I have taken Plan B three times before, within the course of 2 years. However, I was scheduled to start on March 23rd, and I never started. On the 26th, I began to have light bleeding, basically spotting. It only showed when I wiped down there, and it wasn't a constant thing. It lasted on and off for 4 days. 

As for the month of April, I am scheduled to start on the 24th. However, I am experiencing the light bleeding/spotting again. I feel cramps, just like I do when I'm on my period, and I am SUPER bloated! So I am confused on what this spotting is. In my previous experiences of taking Plan B, I have never experienced the light period or spotting. My period always showed up within 3 weeks. 

NOTE: he never ejaculates in the condom while inside of me, I always give him a HJ to finish him. 

•IS THIS MY PERIOD AGAIN, JUST REALLY LIGHT?

•AM I PREGNANT?

•IS IT TRUE THAT IF YOU ARE OVER A CERTAIN WEIGHT IT WON'T WORK? 

HELP!