One, there's manipulation of the blood, like the mind control spell Idunna casts on Hawke. She doesn't need to damage herself or Hawke before casting it, but it's still considered blood magic because it twists blood.
Second kind of blood magic is magic powered by blood. As I understand it, these kinds of spells are technically cast-able without blood, with varying degrees of "technically". Sometimes you just want to give a small boost to a spell you can already cast. Other times, the spell is so "big" that, to cast it without blood magic, you'd need several Cartas' worth of lyrium. For example, entering the Black City. Technically possible without blood sacrifice (for people with petrify beams for eyes), but impractical.
I assume we're dealing with the latter, blood-powered case.
So, if the spell is massive, yeah, you'll probably need lots of violence. If you're just using blood to cast regular stuff, it really boils down to whether intent is important to blood magic. Could you opportunistically use blood if you got wounded in battle, even if you didn't intentionally create the wound? Possibly; reavers can retroactively use their wounds, and they're next-door neighbors to blood mages.
If it's possible to do that, then I don't see why periods would be exempt. They drain a small amount of blood compared to total volume, but I assume the stabby variety of blood magic drains a similar amount. If a blood mage is draining enough blood that they're close to feeling woozy, that's way more than they can afford to lose mid-combat. So even stabby-stabby blood magic probably stays in the <100 mL range, unless they're very reckless or using someone else's blood.
Besides, Hawke's blood magic animation is literally stabbing themselves in the abdomen. Clearly it's a sign
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