mis my pills

I was about to drink my pills regularly and i forgot to drink it last oct 18 and 19 coz i forgot my pillin the office so the following monday dated oct 20 i drink 3 tablets but the same problem i had last 26 and 27 so i drink it again 3 tablets on 28 and now when i check my calendar my period is late 4 days already. Am i pregnant or not?