All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Semen is pure according to the view of the majority of the scholars. This is the chosen opinion and the view that we adopt here at Islamweb.
Accordingly, there is no problem in your issue at all. If we presume that the semen stained the bed, then this does not harm because it is pure. Therefore, it is not an obligation to purify the bed or the clothes that are stained with it.
You should get rid of these whispers as giving in to them leads you to a great evil.
For more benefit on whispers about impurity, please refer to Fataawa 394171, 386950, and 386812.
Allah Knows best.