Miscarriage options

My dr said I clearly am having a miscarriage but I have to go back Monday again just to double check. No growth in a week or heartbeat. They said my options are either wait until my body recognizes I'm having a miscarriage, get medicine to help start the process or surgery. I'm not sure what to do since I have no idea when my body will notice since I should be 7 week now but only showing 6 weeks. I have no idea how long it's been this way because I would've been 10 weeks at my first ultrasound but thats when we seen I was only 6. Any advice?