No, it does not. The system is designed in such a way that no credits are utilised when a member accepts a proposal.
To check the same, you can visit your Dashboard > Introductions and click on "Reply" to check if that introduction was through a proposal.
If the business has sent you a proposal you would see "Sent a proposal" message indicating that no credits have been utilised for such an introduction.
If you do not find "Sent a proposal" message it indicates a direct connect which has utilized your credits