You should not have been so careless regarding your pills and about having unprotected sex. Yes, you do have chances to get pregnant. Once you miss a pill, you should take it as soon as you remember. If you miss 2 pills you should take it immediately as you remember. If you miss more pills you should take medications for emergency contraception
within 72 hours.
Since you have been missing pills and did not use a barrier method either while having sex with your BF. You should not wait till Sunday, you can get pregnant. You are in need of "Emergency contraception". Visit your gynecologist and give her a detailed history so that you can be at a safer side. Take care.