About gst 3B filling

sagar tatti (75 Points)

20 March 2020  
I have registered on 06-02-2020.
my returns due date is 22-03-2020.
so, I have not made any sale in feb.
bt, I made purchase in feb. I paid gst on that also. it's reflected in my GSTR2A. bt it not show in my electronic credit ledger. and
Lastlly I hav one doubt how do I file my GSTR3B for the month of feb-20.
either nill return or any mode.
if I choose nill return bt I hv made purchase in feb is it reflect in my GSTR2A later?

plz, guide me. 🙏