Waiting for my results... (TMI)

4 weeks pregnant and started bleeding at 2am passed a quarter sized tissue. 3:40am bleeding got heavier and passed another tissue. Called my ob and they told me to come in today. Got my blood drawn and now waiting for my results... but I think/know I got a chemical pregnancy... I went to walmart after I got my blood drawn. Went to the restroom heavy bleeding again and passed another tissue... cramping is on and off and today I've been having sharp pains on my back. My mind is blank... I don't know what to think... I'm just so heartbroken...