PLEASE HELP ? 2 cycles in ONE month ?

My regular cycle was 5 days late yielding a date of April 1 to 5th. Here it is April 12th and it started back up yesterday.

I noticed that my breast was still sore AFTER it went off on the 5th and it never went away so I thought that was strange.

I have an Appt for next Wednesday but I was told if I start passing huge clots to take a trip to the ER. This is the first time this has EVER happened. Truthfully , I’m a little worried and confused.

Has this happened to anyone before ?