I am a 15 year old female and I have smoked since I was 8 everybody in my family smokes I have been around it my entire life and I'm constantly coughing up mucous with gray stuff in it and when it gets really hot I cough constantly
It is unusual for a lung lesion per se to cause pain.
Your symptoms may be because of "pleurisy" which refers to inflamed covering of the lungs, or because of a muscle/bone involvement.
If you do not have cough, fever, or breathlessness, you may like to try pain-killer ointments like diclofenac gel. If symptoms do not improve, you may like to visit your doctor.
A caveat, though. Since you are pregnant, please check with your treating doctor before using any medications.