If by too early you mean while there is still an effective policy on the property, then you should cancel the force placed policy. If there is any premium from it the bank will have to pay it.
If by too early you mean during the 45 day notification wait, then there should be no issue as long as you give the borrower the full 45 days to obtain their own insurance and only charge them for the force placed insurance on the 46th day (assuming they didn't get their own during that time period).