This is a genuinely common concern, and one many women feel uncertain raising — so it's worth addressing plainly. Starting your period during Hajj or Umrah doesn't stop your pilgrimage, and most of what you'd planned to do can still go ahead.
The main restriction, according to the majority of scholarly opinion, is Tawaf — circling the Kaaba is not performed while menstruating, since it's treated in the same category as prayer in terms of purity requirements. Sa'i (between Safa and Marwah), however, is generally permitted regardless, along with the vast majority of the other rites — standing at Arafah, the days at Mina, and the stoning at the Jamarat are not affected.
In practice, this usually means delaying Tawaf until your period ends, then completing it afterward — for Umrah specifically, this can mean staying a little longer than planned, which is worth factoring into your schedule if you're able to build in some flexibility. Exact guidance can vary between schools of thought, particularly around specific edge cases, so this is genuinely a good question to raise with your group's guide or a scholar you trust rather than relying on a single general answer.
Some women choose to speak to their GP before travelling about options to delay their period for the duration of the trip — this is a personal medical decision between you and your doctor, not something we're able to advise on, but it's worth knowing the option exists if you'd rather avoid the timing question altogether.
Whatever your situation, please don't feel you need to navigate it alone or in silence — our team, and your group leader once you're there, have supported many pilgrims through exactly this, and are genuinely there to help you plan around it rather than judge or complicate your journey.