early miscarriage--am I crazy??

Sydney • 6 angels 🤍🤍🤍🤍🤍🤍 Son via adoption 🩵 Due with miracle boy in Feb 🩵
A couple of weeks ago my husband and I found out we were pregnant on our third round of Clomid. We got 5 BFPs (a little excessive I know 🙈), each on different days, 4 different brands/boxes. On Saturday night, I started having some light bleeding which continued on into Sunday. I went to my OB Monday to get checked out and got a negative urine test...they took blood and called me back today saying that I was never pregnant. I am so sure that I was...and the bleeding I am now having is in large clots, like a miscarriage. Is it possible that I had already miscarried by the time they took the blood so the blood test was negative? I have been mourning a lost child for three days and now they are telling me there never was one and I'm devastated all over again. 😔