No-one - not even doctors - is infallible. We can all be wrong at times. So, yes, it is possible - though it would generally be unlikely. You need to ask the doctor why s/he said that the man can't get the woman pregnant.
See a doctor.
Obstetrician
If the woman has recently had sex and is no longer getting her period and has pregnancy-like symptoms, she should see a doctor to see if she is pregnant. It is definitely a possibility.
OBGYN-Obstetrician/Gynecologist
yes they can and they can do it without you knowing
Yes, she can. But a test will clear any doubt.
Yes they can. They use ultrasound.
You have to ask your doctor about that.
Yes, only paracetamol though
yes you can, just wait a wile though
No. As long as there is semen ejaculated into the vagina, there are a possibility of pregancy.
Yes, but you always want to check with your doctor and get his/her opinion first.