Thanks for your question.
The good news is that you can apply to become a dependent on his Tier 2 Visa from within the UK provided your Visa is still within time.
You will have to show that you are married (marriage certificate), that you will require no access to public funds and that you have enough personal fund to support yourself for the entire time of your stay here.
I doubt I need to say this, but there is of course the danger that your husband loses his job (for whatever reason) and then your dependent visa falling away because of this.
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