sex a day after periods got over.n vomitted on the 11th day.

i had unprotected sex with my boyfriend,a day after my periods got over.
he didnt ejaculate inside me.but i am afraid coz his manhood was wet n a little bit white when he was inside me.

Also,10 days after having sex,i had severe headache due to excessive exposure to sun (that day temperature was around 40deg in Delhi,India,where i live).
after 4-5 hours of having continuous headache........i felt sick inside,n finally vomitted twice.
I am afraid that i might be pregnant.What am i to do,coz my parents would kill me if they come to know that i had sex.....let alone the fact that i might be pregnant.

also can someone tell me that if i there are any chances of me being pregnant,then should i go for a blood test?.....coz i have heard that urine tests are not reliable at this stage.........n i dont want to wait till i miss my first tperiod.

also.....are the miscarriage pills able enough to lead to a miscarriage after 2 weeks of getting pregnant?

its really urgent.....coz i cannot wait ......i dont want this to increase any further.please telll me any more symptoms of pregnancy......coz i wanna check out each and every thing.