@borislav12 based on your answer , you are no-longer an exempt ( from counting days present towards SPT) person. However as I said earlier FICA requirement is not directly affected by your immigration status.
Here is an opinion from the IRS on the subject of FICA exemption -->
Student FICA Exception | Internal Revenue Service (irs.gov)
Also there may be Tax Treaty conditions that apply --- which country are you from?
The return of FICA taxes collected rests with your employer -- but is not generally preferrable.
