Okay so i finally met a doctor who has seen what i had, once. It is fairly rare and usually happens as a complication of something else like blood thinners or surgery but it can also happen for no apparent reason. It is called a rectus sheath hematoma and you can google it.
I guess i had a #2 cause they told me 2 to 4 months recovery. (14 cm x 7 cm bleed) No bike riding. Rest and iron pills and maybe cold compresses and Tylenol. Yay summertime is ruined, again.
I will see a surgeon in August to discuss if anything needs to be done, probably not. “The good news in your case is it probably was just bad luck.” So much for those lucky socks i got for xmas.