Is Pregnancy Possible After Unprotected Sex Four Days Apart And Taking An I-pill After Intercourse The Second Time?

My periods date is not fixed. Last month I got my periods 7th December to 10th December. After those days I had sex 16th December and 20th December. He fall his sparm inside me this two days. 16th December after sex i didn t ate ipill but 20th December after sex within 2 hours I ate ipill. Is there any chances of pregnancy? If it s yes then please help me doctor i can t want this pregnency. I m so depressed. I can t got my periods this month now. Please doctor help me.