If you are 100% sure that what fell on your clothes is impure! you should wash it. But if you have your doubts, it is still pure.

I poured some water on the toilet seat because some menses stains had fallen on it. During this, some of the water fell on the wiper. I decided to wipe the wiper with wet hands to get off any najasa that may have gone on it. In the process some droplets fell on my clothes but I ignored it. Are my clothes impure? If they touch other clothes will other clothes become impure too?

Purity | September 2, 2014 2:40 pm
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I touched madhi on a pad & accidentally wore underwear without washing my hand. After washing my hand I realized that the underwear got impure so with CLEAN hands I took it off & wore clean pair of underwear. After this however, I didn’t re-wash my hands. I thought about it later & started getting anxious. Is it ok that I didn’t wash? I don’t even know what all I may have touched after that.
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Before every salah I have this urge and thoughts to check if I released any madhiy. Is it ok if I don’t check before my salah or must I check before praying?