I'm no expert, but I think sometimes women can spot after intercourse and it means nothing. If you don't trust your doc, definitely get a 2nd opinion. Did the doc give you some possible explanations? Do you use a birth control that could cause this? Rough sex can lead to spotting too;)
You can not feel cervical cancer. Have you had a thin prep pap smear done? If you don't like what your doctor is saying get a second oppinion. Don't play around with your life. It is too short.