help!

I finished my period a week ago and it was a pretty normal period apart from being 3-4 days early. However for the last two days I've been having cramps like my period is going to start even though I've already had it. Also might be bloated as my stomach looks Huge. It honestly feels like I'm going to have my period except you can't have two periods within a week of each other. Cramps after my period ends isn't normal for me, let alone feeling like I'm going to have a second period so I'm just wondering if something strange is going on. If any of you have had this or have any suggestions for what it is please comment! I also have a really bad stomach ache.