Short Answer, yes, maybe.
What would be pretty phenomenal is if you had several batches on stability, and you could pool them. ICH Q1E talks about this process, and luckily, it's easy to do in JMP.
The trouble with having just 3 data points, is that the confidence interval will be large so, your calculated expiry date is going to be conservatively short.
If you have time, take a look at this talk:
https://www.jmp.com/en_gb/events/ondemand/technically-speaking/pharmaceutical-product-stability/watc...
It explains how to calculate expiry in more detail along with the stats.
JMP Systems Engineer, Health and Life Sciences (Pharma)