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Unfortunately, in order to receive unemployment benefits you need to be terminated through no fault of your own, and cannot have voluntarily quit your job.
The only circumstances in which you can receive unemployment benefits after quitting your job would be if you had good cause to leave your job, which would mean that the employment circumstances were bad enough that a reasonable person would not continue to work for the employer.
The reasons need to be "real, substantial, and compelling and would cause a reasonable person genuinely desirous of retaining employment to leave work under the same circumstances."
See the definition of good cause:
"Good cause" is defined in Title 22, Section 1256-3(b):
"Good cause" exists for leaving work, when a substantial motivating factor in causing the claimant to leave work, at the time of leaving, whether or not work connected, is real, substantial, and compelling and would cause a reasonable person genuinely desirous of retaining employment to leave work under the same circumstances. Generally good cause for leaving work is decided on the facts at the time the claimant left work. Unless there is a timely connection between any alleged reason for leaving and the actual leaving, the employee has waived what might otherwise justify termination of the employment relationship and has negated the required causal connection between any given alleged reason for leaving and leaving. The claimant may submit several reasons for leaving work, some of which, when considered individually, do not constitute good cause. However, if one reason which is good cause is a substantial motivating factor in causing the claimant to leave work, the claimant's leaving is with good cause.
Taken together, your reasons may be substantial enough to constitute good cause, especially being treated differently on the basis of your use of maternity leave.
You should file a claim for unemployment benefits, which you can do online here:
If you were being treated differently based on your use of maternity leave, then you would likely have good cause to leave employment, and could have the basis for a discrimination claim.
You can file a claim with the EEOC using the instructions here: