Tahaarat

Woman in istihaadha performing asr and qadha of zuhr with the same wudhu

Q: Today was my max day for menses. I was supposed to do ghusl at 6:27pm but the bathroom was in use so I ended up doing it a few mins before asr began (I was in the bathroom at 5:51pm and asr began at 5:55/5:58pm). I finished ghusl after around 20-30 mins after began. I’m in istihadah. I dried my hair then read qada of zuhr and then I read asr with one wudu. Is this fine?

Doubting if impurity fell onto the toilet seat

Q: I have a question regarding washing a place that is najis. I usually can see when this particular thing falls on the toilet seat but I know some water did flick off my hand when urine was on it. I washed the inner half of the seat, but was doubtful if it had gone onto the outer edge of the seat. I can usually see it if it falls on all parts of the seat, but because the seat didn't have anything on it I am still doubtful that it may have flicked onto the edge of the seat. My thigh also touched those places thats why I'm worried if it transferred onto me. I also saw something flick off my hand, but cleaned the floor because it felt like it hit the ground and not the seat. All of this is putting a lot of doubt in my mind? What should I do?