Looking on the internet deeply has found these results:

its not a big mistake is the most popular phrase on the web.

its not that much mistake 10 results on the web	its not a big mistake 1399 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Dec 21, 2015 ... +Sulaiman Ali its not a big mistake, I didnt even notice it because I was enjoying the drama so much!?. Read more Show less. Reply � 1�... Aug 8, 2015 ... If its not a big mistake they will overlook or change it. Just talk to them if they don't listen then you have to apply afresh. Written Oct 25 � View�... Its not a big mistake you was out of your mind,you did a mistake tell her the whole story she'll forgive you if she love you like you love her cheers! replyreport. ... their daily life so i hope its not a big mistake if they forget their friends birthdays or anniversary or any important events.Facebook has good feature that it alerts�...

its not that much mistake

10 results on the web

its not a big mistake

1399 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Dec 21, 2015 ... +Sulaiman Ali its not a big mistake, I didnt even notice it because I was enjoying the drama so much!?. Read more Show less. Reply � 1�...
Aug 8, 2015 ... If its not a big mistake they will overlook or change it. Just talk to them if they don't listen then you have to apply afresh. Written Oct 25 � View�...
Its not a big mistake you was out of your mind,you did a mistake tell her the whole story she'll forgive you if she love you like you love her cheers! replyreport.
... their daily life so i hope its not a big mistake if they forget their friends birthdays or anniversary or any important events.Facebook has good feature that it alerts�...