Blood test caused nerve damage?

I had to have some blood tests taken about two weeks ago and ever since, my arm where they took the blood from feels incredibly weak. You can actually feel how much softer the bicep is compared to the other arm. Could the nurse possibly damaged the nerves, or muscle, when she injected the needle? If so, what can I do to restore this? I’ve booked an appointment with my doctor but it’s not for another month.

Any help is appreciated.