Could i be pregnant.please i need opinion past experiences?

is it possible that i am pregnant?i had the 29th of last month pull out method but i know there was come leaked into me i was on my second month on the yasmin pill i started it on the saturday i missed sunday and took monday tues and Wednesday and it was wednesday we had i stopped taking it after that.i got my period on the 3rd(i think)..does that mean i didn't conceive or did i just bleed from coming off the pill?the last few days iv weird stomach pains and very bad heartburn and feeling sick at night and thick discharge.i also had unprotected on the 15th of this month using pull out method xx