I wanna know till how many days after an intercourse,pills such as NORLEVO or MALA-D are effective? Is vomitting continuous or just once? If periods start on 11 till 15 & intercourse is done on 17-18 then will it result in pregnancy?Isn't urine pregnancy test reliable if done only once? How many days after an intercurse urine pregnancy test must be done for perfect results?REPLY SOON!PLZ!