My Af went like this after my 2nd c/s although not for as long.. still 5-7 days but the actual cycle length was all over the place.. 7 days to 45.. Drove me nuts..

I didn't get spotting tho only getting that this time...

I think it is more to do with having a baby rather then a c/s

ps my 2nd cs was my 3rd pregnancy as well