Change of Status from B2 to F1

[helpwanted232]

Hello,

I wanted to change my status from B2 to F1, i went to college and they gave me F1 form, so by completing the checklist for change of status i sent all the documents to USCIS including my spouse details too.

USCIS received my documents on 8th March 2019 but till now i have not received any confirmation from USCIS that they have received my case.
My I-94 will expire on 7th May 2019 (around 2 months from now) and program start date on my F1 is 17th May 2019.

Now my question is,
1) What shall i do while waiting ?
2) Can i stay in US legally while waiting from USCIS response, OR do i have to file an extension?

My college told me that once i file my case and got my receipt number from USCIS i can stay, but someone told me its only for EXTENSION and not for Change of Status.

Can anyone please guide me on this, i am not working with any lawyer, just relying on what information i received from my college.

Thanks in advance!