I Had Taken Postinor 2 On The 30th Of January

I had taken postinor 2 on the 30th of January after having unprotected sex and had my periods on the 9th of February...i usually bled for 3 days though this time I had slight bleeding on the fourth day...I have a 28 day cycle so I assumed my ovulation began on the 22nd of February. ..I had sex with my fiancee on the 20th at around 1am so I'm wondering can I be pregnant since logically I had sex two days prior to ovulation. I want to have a baby with him