Feeling so sick

Monica • Baby boy born 8/7/18. Baby girl born 3/9/16. Learning so much about life and love being their mama.
Just woke up at 3 am so nauseous and throwing up. How am I supposed to take care of a baby if I'm sick? Ughhh I feel terrible. 
My next thought...could I be pregnant? I'm breastfeeding and taking birth control, but I've been so bad about taking it on time. Sheesh.