hi,i am a 20 year old girl,54 kgs,5 6 ,with prior information i had intercourse on the day when my period date postponed.my date was 24th march and i had it on 26th march.till now i.e 11th april i haven t got my periods.i had a urine test aft 12 days aft 26th march,the tests were -ve,r there still chances of me getting pregnant? looking forward to your reply. help