Question! HELP!!!

Lianna
So my cycle has went from a normal 28 day regulated on time every month to a 24 day cycle the last 2 cycles. So i have updated my info to a 24 day cycle. My last period was only about 2.5 days long, not really heavy, but anytime I wore a tampon it hurt.
I am currently 7 dpo, falling asleep constantly, can barely eat, threw up my lunch, light cramps today, sore nipples, emotional when it comes to everything. I have acne like a teenager. What could this be??? Help. We don't use any protection and are somewhat ttc#1. Not sure what else this could be. Any insights would be greatly appreciated.