Bleeding

Lisa • 36 years old, first time mom after 7 years ttc, baby boy Colton born Aug. 23rd 👶. Lost 2nd baby at 7 weeks.
So I am having occasional bleeding and/or spotting. I'm 15w3d. I see my dr on Tuesday, but in the meantime my gf has freaked me out saying it could be placenta previa. I was coughing really hard and wonder if the bleeding has anything to do with that or if it's just my cervix being irritated. I seem to bleed a little every 4 weeks.