Mirena removed after 4 yrs....

Erika
So, I had my mirena removed 3wks ago after 3 1/2 yrs only to find out 2 weeks later that my bf was cheating on me the whole 3 yrs of our relationship...😢 we have had unprotected sex at least 4 times in the 3 weeks since its been out. Is it possible to get pregnant that soon after??? I'm hoping not and I have an appt to put it back in but I'm scared. Advice???