It depends on the judge and the fine amounts for your cases. In many courts, Judges are reluctant to have defendants "sit out their fines in jail," especially if they are pregnant. Also, you might be able to perform community service or have the judge waive fines if you are found indigent. You should also consider contacting the lawyer referral service in your area to see if any attorneys would take your case for a reduced fee or pro bono (for free).
Nothing in this answer constitutes an agreement to represent you in any criminal case. Additionally, the information provided above does not constitute legal advice.