If she was clean and saw her purity, it is permissible to have intercourse with her even before the 40 days are over. However,if the blood returns, you must refrain again.

sheikh in great confusion and distress as after my wife had her child after couple of weeks she said she is not having any discharge (was confued as well wasn’t sure but nothing happen for last couple of days)and we have a intercourse but later i found out that it nor permissible to have any sexual interaction with wife before 40 days after birth of child.feeL guilty since.