Gross period question.?

Exactly two months ago I had my first period. It lasted 4 days. Here in the past week, the very few zits I have are painful and won't pop but are super red. On Tuesday I got really bad cramps but only later at night. Some nights they are really bad but others I don't even get them. This is the gross part. Probably since Sunday, almost a week ago, my stomach keeps churning and churning and growling. I've had really funny poop lately that really burns my "you know where" it's gotten pretty bad to where I poop about 3-4 times a day these past two days. It's not all runny but it isn't exactt solid. Is this a pms sign or am I sick? Cuz I feel fine