Tax Liability Breakup Gst

Dear Sir,
I am if i am qrmp scheme under Gst,
Sir maine jan month mein excel sheet par sale-purchase computation kiya aur 2500 output tax bana wo self assessed challan bana kar jama kara diya lekin feb mein purchase zyada hone ki wajah se koi tax nahi bana. aur ab qtr end means march month mein teeno month ka 15500 output tax banta hai output tax banta hai jo ki maine (15500-2500)= 13000 jama kara diya.
Dear Sir Mera question yeh hai ki abhi gstr-3b mein nayi tab activate ki hai aur maine abhi tak koi bhi return after due date nahi file ki hai to mujhe is tab mein kuch data feed karna hoga kya ya nahi. pls tell me.
thanks in advance....