First thing was a vivid dream where I woke up and I just had a feeling I was pregnant. Also I had swollen/tender breasts which usually subside before my period is due. And exhaustion... i was so fatigued that I couldn't last more than 5 minutes doing my normal gym routine.
A weird hormonal headache, which I had never previously had, and sore boobs. I also started having extremely vivid dreams every single night, which I continue to have today at 30 weeks pregnant. Not a night has gone by that I haven't dreamed since we conceived.
Tender breasts, fatigue and morning sickness..all signs I was mistaking for my period until it lasted 2weeks when my fiancé and his daughter cracked a few jokes that made me realize "this could be it"!