Yes
When you made the loan to the entity, the entry should have been like this (assuming it was cash)
Debit Cash $x,xxx
Credit Loans from S/H $x,xxx
Thus at the time of the loan, balance sheet should have been in balance.
If want this to be truly a loan, you need to treat it as a loan...just as if it was from a third party. A no interest loan may cause problems under IRC Section 7872. See the link below. You should also have plans on how the loan is to be repaid. If no intention to be repaid, then it should be a contribution of capital rather than a loan.
https://taxmap.irs.gov/taxmap/ts0/belowmarketloans_o_3211d2c8.htm
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