<s>[INST] Hi. I am 28 weeks pregnant and I woke up last night with sharp pains in the lower left side of my chest. The pain comes when I breathe, especially deeper breaths and also when I try to bend forward. I m pretty sure it is not the baby as he has been moving and he sits really low and the pain is still there today. Should I take a trip to the er since it is the weekend or wait it out? I m not really sure what is causing this and at times can be excruciating. Thank you. [/INST] Thanks for your question on Chat Doctor. In my opinion you are having pleural effusion.  As pregnancy can be a risk factor for this. And pleural effusion causes pleurisy (inflammation of pleura), this is the reason for pain during coughing, sneezing and deep breathing. So possibility of pleurisy is high. Since you are pregnant, chest x-ray is not recommended.  So get done ultrasound examination of thorax to rule out pleural effusion.  Ultrasound is safe in pregnancy so no harm in it. If ultrasound is normal than you mostly have musculoskeletal pain. So take good painkiller and muscle relaxant. </s>