Missed 2months bills in filling gstr1 for quartely upload but paid full tax & filled all in gstr-3b

Hello All.

I have opted for Quartely Returns of my company.

While GSTR1 Filling for quarter (April to June), By mistake i have added Invoices of only 1month - June and have filled it.

I have missed adding B2B invoice for April And May Month in GSTR1 and already filled it.

Though i have added B2B bills and paid the correct tax amount in GSTR3B for April, May And June, all 3 months.

All my customers are registered GST payer.

How can i rectify it now ??

Thank You.