Running a half marathon and need advice ASAP 😬

help! I’m running a half marathon this weekend and my period just started. I’m still so new to period underwear/cups that I haven’t really found a good combo or thing that works. TBH what I used to do with tampons and pads wouldn’t really work for this long of a race either. I’m willing to overnight a bike short/athlete-specific option that could hold up to a fast-ish 13 miles if anyone has any that they realllyyy love.

I currently have Goat Union midis that are the maximum absorbency, their lighter absorbency boy shorts, and a cup. I’m worried about the cup leaking and I’m worried about the boy shorts chaffing with that combo, but I’m also worried about the midis not being absorbent enough because they didn’t make it 5 miles with me last month.

I know I should have seen this coming, but all signs pointed to it starting last week and being done come race day 😞 any and all help is welcomed!