Hi Lily,
I have not been in that situation with Crinone, but did something similar with my Lucrin injections when we first started. In the end I rang the nurses at our clinic and they gave me instructions - I think that there is generally some lee way, BUT that will depend on the med and the time in your cycle.

I figure we pay the clinics enough - so if your clinic has nurses or a FS on call (I'd start with the nurses), then ring them and ask their advice. Trust me, you will not be the first to, and you wont be the last - answering questions like yours is a big part of what they get paid for - and hearing what to do first hand from them will put your mind at rest.

Good luck.
FG