Early twin symptoms??

Lily
Hi everyone. On 20th of Nov I had 2 frozen embryo transfer. In less than a week my hCg test showed positive (not because of shots). I have back pain, bloated, it seems I'm 3m pregnant, period cramps and i run to the toilet every 5 minutes. No one believes that I have such strong symptoms so early. Can this mean I'm pregnant with twins? Has anyone had it?