Weird symptoms

Kayla

So I started taking Lo Loestrin pills Jan 26th. I started experiencing heavy nausea that I was not experiencing with my IUD previously ( I had no symptoms on my IUD). I decided to stop taking my pills 9 days ago now I am having constant nausea,headaches and constipation. I did have withdrawal bleeding for 2-3 days and had sex shortly after that. Could my symptoms be from my birth control leaving my body?