Bleeding at 7 weeks with blood clots

Momshies I'm an ivf patient and I am now 7 weeks pregnant. I got shock when I woke up this morning my underwear was full of blood and when I went to the toilet a big blood clot came out from my vagina measuring about 2x2 in diameter. It was quite big and heavy. Im so scary and worried now. Has anyone of you experience this? I am hoping and praying that this is not a sign of miscarriage :(