Spotting lightly without missing a dose or taking a pill late?

I've been in the er for a HORRIBLE migraine that just wouldn't go away for the past two days—I was just wondering if the stress from that could cause me to spot lightly even when I've been consistent with my lo loestrin? I'm not due for another period for 13 days, and stress has consistently caused me to have fluctuations in the past when I wasn't on birth control. I was poked for an IV 5 times and in a lot of pain and extremely stressed, so it wouldn't be that surprising but I was just wondering if this has been the case for anyone else? Either the stress in general or the migraine itself?

Thanks!!

Edit: I'd like to mention that I don't think my birth control caused this migraine. I've been taking a lot of tylenol recently for mcas flareups and other headaches, pretty sure that had something to do with it.

Second edit / update: it's turned into heavier red bleeding, still light but it seems more like the start of a period because I'm having some light cramping as well. Should I be concerned?? Gyno won't respond till Monday.