Can you still get pregnant on the first day of your fertile week?

Miranda • I am taken since January 19,2012. Been trying to have a baby since Oct. 2015. I am 19 years old my boyfriend is 23
I have unprotected sex with my boyfriend the first day of my fertile week. That's it. I have a few days left(Glow says I do) in my fertile week. Is it possible?

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