I started my periods on 19 April and I had unprotected sex on the 3-5th May and on the 7th may I was spotting pinkish and I only notice when I was bathing and it disappeared. Last week I started feeling nauseas and bloating and I am unconfortable when wearing a bra. I tested for Pregnant on the 17May but it was negative. I am feeling hungry but I have no appetite and I am scared to eat cause I feel like vomiting. Today 21st May I started spotting , I wore a pad since morning but nothing came out yet and I am really feeling very sick and nauseas and feeling very hungry but I just don't have appetite for any food and I am very weak. Is the something wrong with my hormones, I didn't experience this sickness before

It could be anything. You need to wait until your period is late, consult with your Pharmacist and buy a HPT, use it according to the directions.