Some hospitals won't let you birth the 4th or subsequent without a canula inserted because the risk of heomarraging is apparently higher. never really looked into it myself, as I didn't want to over stress about something that might not even happen.

I had a bleed after DD2 & so was watched after the births of both my younger kids, but never had an issue. And I still didn't have to have a canula inserted.

Educate yourself, & remind yourself that 70 years ago it was common for women to birth 10 or more babies, one after the other. Medical support then wasn't what it is now.