وَإِذَا حَاضَتِ الْمَرْأَةُ عِنْدَ الْإِحْرَامِ اغْتَسَلَتْ وَأَحْرَمَتْ، وَصَنَعَتْ كُلَّ مَا يَصْنَعُهُ الْحَاجُّ، غَيْرَ أَنَّهَا لَا تَطُوفُ بِالْبَيْتِ حَتَّى تَطْهُرَ
Translation: If a woman menstruates when entering ihram, she bathes and enters ihram, performing the other Hajj rites but not tawaf of the Kaʿbah until she becomes ritually pure.
Menstruation does not prevent entering ihram. Tawaf waits until ritual purity. Bathing here prepares for ihram; it does not make tawaf permissible while menstruation continues.