losing a twin

i found out at 6 weeks it was possibly twins, 8 weeks it was twins, 10 weeks still twins. maybe not exactly those dates but around them.Unfortunately today after pain all weekend, drs appointments and all sorts i had a scan and one baby stopped growing. Its measured smaller than the last time i had a scan which confused me. anyway, has anyone else had this? my remaining bavy is measuring 12 weeks. happily bouncing around. i didnt really see as they kept the screen close but sam saw. the midwife kinda lady said they wont intervene. it wont be like a miscarriage i had last year. i may not bleed but it wont be near as much as the remaining baby will squish and absorb it. It sounds bad and will probably change but im feeling okay about it all. i have a baby still, i havent lost both. its more accepting and im not angry. for all i know when i go next week for a scan it might all be gone and if i hadnt had earlier scans then i would never of known it was twins. has anyone else had this as i just want advice on what to expect?