About a week ago, I emailed three of my MA tutors to ask them if they can write me a letter of recommendation for my PhD application. No one has answered yet, though. I know that tutors are busy people, but really, it was just a "yes or no" answer. In addition, I explicitly stated on my email, that if they didn't feel comfortable writing a LOR for me, they shouldn't feel obliged, etc.
My question is: Should I interpret their silence as a discreet 'No' or am I to assume that they've probably forgotten or the email slipped through the cracks, and send them a second email to remind them?
Thanks for your help, it's much appreciated!
P.S. I know what I'm asking sounds a bit funny, but I'm really at a loss here, cause I definitely don't want to be annoying, but without references from my MA tutors, I probably can't apply for a PhD, at least to some UK universities.