Finding blood on one's clothing after making ghusal

Whilst doing compulsory ghusl, you get a cut from a razor when removing hair from private parts and you realise this after few hours only due to seeing some tiny spots of blood on underwear, then is the ghusl and all the namaz prayed valid? Should one repeat the ghusl and namaz? I'm not sure if this was flowing. The tiny spots of blood would equal to a small amount of blood less than a coin however, the spots were scattered over an area of the underwear and this area could potentially exceed the coin size.