The rights of an employee in case of termination for pregnancy

Good evening,

I have been working for this company in Dubai for almost 4 years now and I have received a bonus of good performance and dedication at least 2 times from my employer.

I recently got pregnant and informed my boss. Note that this is my second pregnancy in the same company and I have worked very well with no absences or sick leaves.

All of a sudden my boss sent me an email to terminate my contract stating the reason for termination as due to unsatisfactory performance.

I would like to know if she had to right to do so knowing that I am pregnant.

Thank you.