Help? Pill/iud removal

Joanna

Hello, i had my iud if 3 years taken out on Friday. I had started my first back of low estrogen birth control pill on Saturday and took it Sunday as well. Today me and my fiancée had unprotected sex and well as he came in me. Now i am worried about my risk of being pregnant cause i didn’t know you had to the pill for up to 5 days preferably a full cycle before using back up.