So the last two months my period has started on the 26th or 27th of the month but glow is saying this month that this is my fertile week and I won't have my period till the beginning of next month. Has this happened to anyone ? For the past week I have been really nauseous to the point I can feel puke in my throat but I don't actually like and I have been having stomach aches that keep me up at night. I can't sleep either... I feel dizzy to the point I feel like I'm going to faint and I haven't had an appetite which is weird for me bc I love food. My stomach hurts when I eat and if I don't. Oh and nonstop headaches! I am a little crampy like a dull ache. How soon can you show signs and symptoms that your pregnant? If I go by this months glow it says my period would in a week but if go by the last couple months it would be on the 26th or 27th.