BFP multiple times & AF is 4 days late. I've been night shift this week and one night half a cup of coffee made me jittery. I didn't eat anything after I woke up at noon today until 630 and got extremely shakey/jittery. Even after eating, 3 hours later I still feel this way and it's an unsettling feeling. Any thoughts if it's pregnancy related or if I just didn't manage my meals well?