Did this happen to anyone and had a healthy pregnancy?

Tamara • Mommy to my 2 beautiful baby boys, Nathan Louis💙 born August 12, 2017 and Parker Joseph May 6, 2019❤️ My whole world😍
On 8/20 I had hcg level of 137 and 8/25 was 214.... Doctor acted like everything was fine because numbers were going up. They did a transvaginal ultrasound, but didn't find anything the night I went to the ER because I was spotting earlier that day. Well the next 2 days I was spotting worse. Like everytime I wipe now and a little bit on my pad. I take a new pregnancy test and it still says I'm pregnant and it's darker than it was a few days ago? What do you guys think is happening to me.. Has this happened to you before.. I'm not even cramping bad or anything. All hurts is my back