Is this normal ?

Lady’s I’m super scared I’m currently 5w5d with my third baby and I started spotting what looks like brown discharge only when I wipe and I went to the emergency room and they aren’t detecting a pregnancy in the ultrasound nor the urine test only in the blood 330 level they told me to go back in two days 😔 I just got home and did a urine test and mine is coming back positive I’m so scared and sad 😢 is this maybe cause I’m early on ? This is my third pregnancy past pregnancies I had preeclampsia so this would be considered high risk