pregnant and bruising easily?

da
Im 16 weeks pregnant and ive realized since two days ago ive been getting bruises everywhere... I just counted them and I have 18 bruises on multiple sites of my body. I am not taking prenatals for personal reasons. What do you guys think could be the cause?? Maybe the baby is taking all my nutrients away and thats why ive been feeling with no energy and always sleepy/bruising easily?? 
Im a nurse but not the ob/gyn specialty therefore my diagnosis can be way off from a spealists point of view.. 
Im still going to a doctors office but id like some insight from pregos that been through it thank you in advanced :)