ghsual

Q: I have been having little doubts about wet dream. I woke this morning and I got changed and went with my day. Didn't notice any wetness or anything, but when I got home in afternoon to pray I got little doubts so I went to check the garment that slept in. When I checked, the garment had very little white dry patches. Since I saw these patches I got more waswasas. Also I put this garment with my clean clothes. I was wondering is this garment impure? Will my prayer be invalid? Is this just waswasas? If it is not waswasas, will the other clothes become impure as well?

Q: Why is it not allowed to read Qur'an in front of the deceased before ghusal? I have found in many places where the deceased are kept for 5-6 hours without ghusal so that all relatives can come and see the face of the deceased for the last time and then buried immediately after the ghusal of the deceased.

Q: If an unmarried girl is exercising at home (on a bicycle) and begins to orgasm or feel turned on, must she make ghusal?