There are various phrases being used here and if this your first foray into UK Corporation Tax, their meaning and differences will not necessarily be apparent.
You WILL have a period between incorporation and ending the day before you commenced to trade. For all practical purposes, however, that is not a chargeable period (assuming the company had no investment income, etc. prior to commencement of trade).
Your next period - a tax-chargeable period for which a CT return is required - will be from the date of commencement until the earlier of (a number of factors but usually boiling down to either)
-- 12 months, or
-- The accounting date you made your company's accounts up to for the purposes (effectively) of reporting to Companies House. Your statutory accounts MAY have covered from incorporation on 9/10/19 through to 31/10/20 even though the company's trade commenced on 2/11/19. Companies House doesn't care particularly when your company started to trade. HMRC DOES care.
It follows from the information that you have provided that your first CT return will be for the period 2/11/19 to 31/10/20. Not to 1/11/20. (What HMRC says is for these purposes irrelevant. When you submit a (correct) return HMRC will simply update its systems and dates accordingly.)
As such, your return is already late and subject to a late filing penalty of £100. If you are the sole director/employee of the company and you have had difficulties in the intervening period then you may be able to claim a "reasonable excuse" so that HMRC agrees to cancel the penalty.
There will be a further £100 penalty if the return is outstanding for 3 months or more. There are also tax-geared penalties if the return is REALLY late.
I trust this is useful.