My memory of it is pretty vague but, there was a guy with blue hair and some other guy he met (blondish brown?) And turns out the other guy was pregnant with that dude because he was a female the whole time. It's not yaoi. It's a full-color action manga like Shen yin wang Zuo. I think it's called moon something.
Manga like black haze?
Bruh, look at the first thing on the list
http://www.mangago.me/home/mangalist/127166/