hi im 42 60kg and 167cm , i had my last period beginning on the 13th/5/11, ending 17th/5/11. on the 21st/5/11, i had a cone biopsy,and have since been given a date for letz surgery... my problem is i have not had a period, have symptoms of pregancy but results of hpt is neg. ccould the biop have thrown my system out?