What did they tell you the charges were ? How were they worded? 45 days isn't felony, I don't suspect. If they already told you how long you would serve ( 45 days ), how it is worded may not be as critical as how long the sentence is. Also, it is possible you can enter a plea arrangement----if you plead guilty.

While I believe you would be charged on three separate charges of bad check writing, Texas has concurrent sentencing guidelines that may be applicable. Some states consider bad checks as misdemeanor, some felony, but some states don't make the designation. Also, some states have laws in place that require the intent to defraud to be the reason behind bad check writing.

If you have no hired an attorney, contact the PD's office and ask for assistance. There may be a way to plead this down with no jail time at all.

Knowing the exact wording of the charges against you would help, too.

Good luck.