She went to the Messenger of Allah and complained to him about bleeding. The Messenger of Allah said: "Rather that is a vein, so look and see when your period comes, then do not perform the prayer. When the period is over, then purify yourself and perform the prayer between one period to the next."
أَنَّهَا أَتَتْ رَسُولَ اللَّهِ ﷺ فَشَكَتْ إِلَيْهِ الدَّمَ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّمَا ذَلِكَ عِرْقٌ فَانْظُرِي إِذَا أَتَى قَرْؤُكِ فَلاَ تُصَلِّي فَإِذَا مَرَّ الْقَرْءُ فَتَطَهَّرِي ثُمَّ صَلِّي مَا بَيْنَ الْقَرْءِ إِلَى الْقَرْءِ