 [ Symptoms ] how do you learn your blood type  even though i have had my blood drawn quite a few times i do not know how you can learn what type you have my dad says i needed blood transpered from my grandpa on his side when i was born and he is ab+ so does that make me that type or something else [ Disease ] cocaine can stay in the system for up to four days depending on how much was used obviously a pregnant woman with any cocaine detected in the system is a very serious problem both for her and her unborn baby