I am 26 weeks pregnant and have started having dull painsin the middle of my chest. i have a slight case of excerciseinduced asthma and placenta previa. are there any precautions that i need to take?

May be serious: This could indicate a problem such as throwing a clot - if this is new you should call your OB doctor and discuss. If it is increasing in severity you should consider emergency care.

See an allergist: You need to see an allergist. Worsening asthma symptoms during pregnancy can lead to additional problems with the pregnancy itself. Since you already have a condition that increases the risk of adverse outcomes of your pregnancy, you need to manage the potential problems that you can. You can't do anything about the placenta previa, but you can keep the asthma controlled.

See your MD: You need to see your doctor for evaluation for your asthma. Your asthma should be kept in good control while you are pregnant to ensure that you provide optimal amounts of oxygen to your unborn baby.

Agree but also: I agree w dr carter, but you could also have a blood clot in the lung blood vessels. Call your ob, who may advise that you should be seen in the closest emergency department.