I stopped tracking my period at all cause I just have a sense for it now and it was annoying when I'd forget to log a period and my tracker would tell me ridiculous things like I had a 97 day cycle or something. Plus privacy concerns. The only time it becomes inconvenient is when a doctor asks when my last period started, which usually just illicits an "I dunno, not abnormally long ago" at which point they ask me for a firm estimate and I throw out a bullshit number that will get them to move on to more pertinent discussions. I got an IUD last year so varying cycle lengths and missed periods aren't without a reasonable explanation.

Anyways, I usually get a dull ache in my upper thigh/lower abdominal area the night before as warning. Mine start out pretty light, so a simple panty liner will keep me covered for the first handful of hours the next day. Honestly though I think I usually catch it by wiping after doing my business and seeing a trace amount of blood there, before I see any in my underwear. Although there have been other times that I just got a sense of moisture at a point, so the panty liner is a nice layer of security.

If I'm going out of the house I keep some regular pads on hand just in case the time comes to bring out the big guns. Menstrual cups are also super safe to get ahead of the flow with though (no risk of drying you out and causing micro abrasions like with tampons) so there's been a few times that I just popped that in from the jump. My workplace also keeps emergency pads stocked in the ladies room (as a last resort, those ones are SUPER bulky for some reason, way overkill)