Strange

According to my app I am at 4 wk and 2 days.. I've been extremely exhausted, struggling to stay awake with my toddler during the day.. mild cramping and I'm having both constipation AND diarrhea (which sounds crazy I know).. already having lower back pain and uncomfortable at night, and so so bloated and I keep having dizzy spells if I am on my feet for too long. This just seems awfully early to be experiencing ALL of these symptoms and I don't remember this with my first