Narrated Aisha:

We set out along with Allah's Apostle shortly before the appearance of the new moon (crescent) of the month of Dhi-l-Hijja and he said to us, "Whoever wants to assume Ihram for Hajj may do so;
and whoever wants to assume Ihram for 'Umra may do so. Hadn't I brought the Hadi (animal for sacrificing) (with me), I would have assumed Ihram for 'Umra." ('Aisha added,): So some of us assumed Ihram for 'Umra while the others for Hajj. I was amongst those who assumed Ihram for 'Umra. The day of 'Arafat approached and I was still menstruating. I complained to the Prophet (about that) and he said, "Abandon your 'Umra, undo and comb your hair, and assume Ihram for Hajj;
." When it was the night of Hasba, he sent 'Abdur Rahman with me to At-Tan'im and I assumed Ihram for 'Umra (and performed it) in lieu of my missed 'Umra.

حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، أَخْبَرَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ مُوَافِينَ لِهِلاَلِ ذِي الْحَجَّةِ فَقَالَ لَنَا " مَنْ أَحَبَّ مِنْكُمْ أَنْ يُهِلَّ بِالْحَجِّ فَلْيُهِلَّ وَمَنْ أَحَبَّ أَنْ يُهِلَّ بِعُمْرَةٍ فَلْيُهِلَّ بِعُمْرَةٍ، فَلَوْلاَ أَنِّي أَهْدَيْتُ لأَهْلَلْتُ بِعُمْرَةٍ ". قَالَتْ فَمِنَّا مَنْ أَهَلَّ بِعُمْرَةٍ، وَمِنَّا مَنْ أَهَلَّ بِحَجٍّ، وَكُنْتُ مِمَّنْ أَهَلَّ بِعُمْرَةٍ، فَأَظَلَّنِي يَوْمُ عَرَفَةَ، وَأَنَا حَائِضٌ، فَشَكَوْتُ إِلَى النَّبِيِّ ﷺ فَقَالَ " ارْفُضِي عُمْرَتَكِ، وَانْقُضِي رَأْسَكِ وَامْتَشِطِي، وَأَهِلِّي بِالْحَجِّ ". فَلَمَّا كَانَ لَيْلَةُ الْحَصْبَةِ أَرْسَلَ مَعِي عَبْدَ الرَّحْمَنِ إِلَى التَّنْعِيمِ، فَأَهْلَلْتُ بِعُمْرَةٍ مَكَانَ عُمْرَتِي.