Weird

So earlier today around 3 I went to the bathroom and when I wiped there was a little bit of pink blood on the paper I thought it was AF even though she isn't supposed to come till next week. So I put a pad in, I've been to the bathroom since then and there was no blood on the pad in the toilet or when i wiped. When I woke up this morning my boobs were super tender and sore. Usually when AF comes I cramp really bad and my back hurts, none of that is happening. So I'm confused. Has something like this everything happened to anybody else?