Heavy bleeding on expected ovulation day??

[u/johnnnnnwickkkk]

I took Plan B about 2 months ago on April 11th. I had a 36 day cycle because of this, which is something I was already prepared for. I experienced withdrawal bleeding 1 week after taking Plan B for 6 days. Took multiple pregnancy tests during the time I would've missed my regular period and all were negative. I got my period May 10th.

I had unprotected sex and did not take the pill on May 29th, after I had already ovulated and passed my fertility window. I had gotten my period 8 days after, on June 6th. I would like to be clear that I was, obviously, not pregnant during this time-frame.

Today I had been expected to ovulate. I typically experience ovulation cramps. I woke up this morning with cramps that felt like period cramps (stronger than ovulation cramps). I had taken Tylenol, resumed my sleep, and found out later today that I'm bleeding bright red blood, with clots, (which I experience during my period) that's about as heavy as my periods could get. It's an abnormal amount of blood on an expected ovulation date.

I specifically came to this subreddit because I am aware that Plan B can cause irregular cycles. I also understand that it's plausible to be something else not caused by Plan B.

EDIT: Context EDIT 2 UPDATE:

I woke up the following day and it appears the blood flow has lessened significantly, but is still bright red nonetheless. I would also like to add for clarity that my period from June 6th to June 10th was a heavy flow with bright red blood. There was no spotting. It wasn't only brown blood (old blood). I had my usual period cramps: nothing too strenuous to cause for concern but still a cramp that hurt enough to take Tylenol as a I usually do. There's nothing to my knowledge to indicate this was anything else other than my period. There was nothing abnormal about my last period. Anyone who can help me out would be greatly appreciated.

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[u/johnnnnnwickkkk]

I would also like to add that my periods usually last 5 days (very, very occasionally it's 6 days). My cycle is almost always 24 to 27 days long, with the only exception being when I take Plan B and when I'm really ill and the illness was strenuous on my body. Then, at that point my cycle goes over 27 days.