To Whom it may concern

I had a oral sex (Fingering done and in my hand there may be little sperm)with my girlfriend on 2 feb 2011,after that she got her regural period on 14 feb & 10 march but her current period that is due on 10 april is still missed i.e.late by 9 days.she has take 3 home pregnancy test on 13feb (prega news) result negative(day urine),on 1 march (prega news) result negative(day urine) & on 15 apr (velocit) result negative(fresh urine) & also taken laboratory (clinic) test pregcolor pregnancy test on 18 mar result negative(Fresh urine).she does not any other symptoms like vomit,nausea,fatigue etc other than missed period.Further after feb we hav not done any sex.
Please advice as soon as possible that there is any chances of pregnancy or not.further what to do should i go any other test please specify.