i don't think any online doctor will be able to help you out.. you should go to a real doctor, of course.. you're 12wks pregnant.. haven't you been to the doctor, yet? if you haven't, you really really need to.
usually, you can find out the sex of your baby around 18wks. i found out at 22wks! & .it's not always 100%. ultrasounds can & have been wrong before.