question: dr im 30 years old lady. im not blessed with baby past 3 yrs. in jan 2011 21st i had my laproscopy. they drilled the pcod . feb 23 i got my first peroid. march 30 till now i missed periods. 30th march morning i done urine pregnancy test it shows negative. how long should i wait to have my blood test? im very stressed person .normally my periods may 30 to 33 days. is there any chance to have pregenant? i had back pain problem now.