Confused?

April 5th was my last period which lasted for 5 days. Going by the app I ovulated on Easter. I had sex on my fertile days and also ovulation day. My next period was due May 5th but it didn’t show. 4 days after no period I go to the doctor and she confirmed I was pregnant with two urine test. Later the same day I started getting cramps in my lower stomach, back and started spotting. Later I have bleeding as if I’m on my period. I go to the ER and the nurse said the test was negative. Currently running a blood test. Have anyone ever experienced this?