Anyone gotten pregnant BD 1 time during fertile window?

Jenna • Had my beautiful son in May 2017. Baby #2 due September 2020❤️

So my fiance and I have been trying for 6 months with no luck. We were very busy seeing family during my fertile week and were only able to do the deed 1 time (2 days before ovulation) Have you gotten pregnant after only 1 time? I'm currently 10dpo today and the test was negative. I've been cramping for the past week as if AF is about to start any day which is the same symptoms I had with my son. I'm just trying to hold on to the littlest bit of hope that theres still a chance even if it's a slim one.