Anyone had this happen?

My period was due 5th may I got a positive on 3rd may then a faint positive on the 5th so I knew it was another chemical did A clear blue digital Friday 6th and Monday 9th both negative but still no period....... Got really sore boobs and sensitive nipples but that's it, I've had chemicals before and still got positive results as I was bleeding, don't want to waste time at the doctors if it's just sometimes normal to take a few days to start AF anyone had this happen?