I have an 8 yr old Dexter that I bought earlier in the spring. Was told she would calve in June or early July....still waiting. Last night I noticed a 6-8" long "string of mucus" hanging from her. Is this an indication she is ready to calve? Usually how long after seeing this will she have the calf. I work away from home but if I know she is going to calve soon I can run home on my lunch hour/etc. to check on her progress. Thank you for any help you can offer.