Yes you can be pregnant, the reason for bleeding or spotting is different. The placenta may be low lying or might be covering the internal O's. So if you experience some kind of bleeding you must go to some 0BS/GYAN or some RADIOLOGIST/SONOLOGIST and get sonography done. Due to heavy work or pulling some heavy luggage the pressure is exerted and cause some injury to placenta,which causes spotting or bleeding. Take it seriously and contact your doctor immediately. Wish you all the best and have a good and healthy baby.