I Had Sex On 10 Aug With My Bf And

I had sex on 10 Aug with my bf and he jus shoot inside my vagina I HV taken unwanted 72 after 18 hours and its 12 Aug today I haven't got my periods yet and my vagina is smelling I think its coz of the tablet and there is continuously somthng going on my stomach which is distracting me ...plz help me its my first time