Yes, heterozygous recessive is a thing it is a particular gene that has identical alleles its has the same letters for a dominant trait it's (XX) and for a recessive is lowercase (xx) just remember the alphabet the D is first then the R so D is capital and R is lower case
Might use the bathroom a lot to get rid of most of the blood because urine is water and if the water changes, the blood changes, so urine might happen if you want to get rid of all of the blood.