K.V.
I know someone that got pregnant after having their tube tied. It does happen. But my sister had bleeding like that after sex and so did I but only when pregnant. Mine was due to the extra blood in the cervex due to the pregnancy and a little to rough intercourse. My sisters did not stop and she started to bleed heavier and through of clots. Hers turned out to be a vericous vien on her cervex and could not be stopped without surgery. If the bleeding is too heavy - sooking through a pad in less than an hour or through off clots larger than an inch alway go to the er or doc. Good Luck