Question:
Is there a time when my wife would not have to check for hymen bleeding? (She already bled for 3 times.)
Answer:
It is unnecessary to keep on checking for hymen bleeding once there was a proper ביאה in the past and blood was then discovered. If never the less blood is found a Rav should be consulted.
Sources:
Aruch Hashulchon 193:11, Teshuvas Minchas Yitschok 5:61