i dont know whats going on


Hey I'm new to this and I'm trying to see what could possibly be going on i missed my period in march and before i had missed it i started not feeling to good it was like i had to throw up but wouldn't throw up and then when i was like maybe 9 or 10 days late on my period i went to the bathroom and whipped and it was light pink blood \ discharge mixed with it on the tissue then when i went to check again like two hours later the blooding had stop then ever since that day i been blooding a light pink. Should i go to the E.R. or make an appointment with my doctor or do both and if im not pregnant then what could it be and im having all the symptoms that I will have with my period but i know its not my period because my second day of blooding will turn red. Im worried it could be something serious.