Could I Be Pregnant Despite Taking Postinor-2 23 Hours Post Intercourse Followed By Bloating, Nausea, And Heaviness In The Stomach?

My woman saw her period on the 2th it ended on the 6th of this month,on the 8th we had unprotected sex,I gave my woman postinor 2 after 22hrs to 23hrs we had unprotected sex,and she use to have ulcer,after three to four,five days she complained about her stomach being heavy,making sounds,adding shape a bit,and feeling like vomiting ,is it a sign of pregnancy?