I know this is a long shot but miracles do happen

Found out I was pregnant last week (3 weeks pregnant) to be exact and now exactly 1 week later I started to bleed and have cramps a little worse then my menstrual cycle for 1 day I’m still bleeding (day 2) I took a test and it’s still positive so I’m hoping maybe I have another twin in my belly has this happened to anyone I know it’s a long shot and I know the worst is miscarriage but JW