Could I be pregnant

I'm 18 and think I might be pregnant I had sex on the 18th & 19th of October this past week I've been peeing like mad boobs have been sore and a weird feeling eating late at night really really moody eating stuff a don't normally eat and crying for no reason sore backs and having slight sickness feeling I'm due my period in 4 days Monday but really need to know if a am or not for reasons