Holding out hope *updated*

So I had a normal period 2 weeks ago, was nothing of concern. Didn’t even cramp like usual? But my body just felt off so I decided to take a test anyway last weekend. Low and behold BFP. Three of them! Mid day! All showed up within a second. But then yesterday I had very very mild cramps. Took some Tylenol and forgot about them. Then around 11pm I started spotting red and brown. So I went straight to the ER already worried about my period before. And they confirmed I was pregnant with my HCG levels at 541. But with ultrasounds found nothing in my uterus. Possibly too early? So they’re making me go back Tuesday to redo tests and check HCG again. Does anyone have any encouraging words for me? Or has anyone had this happen?

UPDATE: Hcg levels dropped 60. Just waiting to miscarry at this point.