Anyone else have this happen during a cycle?!

AF showed 1/4 and was done and gone by 1/7. Last night I started having severe menstrual like cramps and felt like I needed to use the bathroom. I went to the bathroom and noticed some spotting in my panties, when I wiped there was a huge mess of red blood. I'm still cramping, but no bleeding. Is this like a 2nd cycle or what on earth?! It's never happened before. I'm also having some weird feelings in my pelvic region, almost feels like someone is stretching and pulling on my uterus and it's quite uncomfortable. Anyone have any idea or maybe experienced the same thing? Any help is appreciated. Thanks.