Yep and IIRC, I think the monophasic might have the sugar pills too, and many just skip straight to the next pack. Been a bit since I've had to pay attention
If it is bc related, just adds a layer of complexity and shows why it's good to take another look. Maybe it only happened to a subset of women on a triphasic pill who got the vaccine during the week of highest estrogen dosage or something like that. That's going to be a lot smaller population than the full 6-7 million individuals. Which goes to Entropy's point here or in the cave thread that they come out with a rec saying hey, if you are on this or have this condition, don't get J&J, same as how they ask about prior vaccine anaphylactic reactions. The rest of you, proceed with getting it.