I woke up this morning and when I went to the bathroom my underwear was full of blood

I don't know what to do.. I'm thinking whether I should go to the ER.. I know they can't DO anything, but they'd do an ultrasound and a beta to see what's going on.
This is TMI but I also passed a dime sized clot. I'm so upset I've been bawling for the last hour. I put a pad on and there hasn't been much blood for the last half hour.
UPDATE:
Thanks so much for your kind messages.
Just to update - I went to ER. My hcg had risen appropriately (to 34,000 from 14,000 4 days ago) so the doc was optimistic, but the transvaginal U/S only showed a gestational sac measuring 6.5 weeks and no embryo

The doc said they really should have seen a fetal pole - it might be a blighted ovum.
He said most likely it's a miscarriage but I'm going back on Monday for another beta and if the HCG is still going up, then they'll do another U/S in a week or so.
I am really not optimistic - with my HCG numbers they should have seen the fetal pole. Oh and the bleeding is coming from between the placenta and uterus so I don't even think that has anything to do with it being a blighted ovum (I say this because the hcg is still going up).
Oh another thing is the u/s tech said I have a retroverted uterus

He had a hard time getting some of the pics.
I'm really devastated right now.
The bleeding is only when I wipe. But I don't have much hope if there's no embryo
It's really depressing when the triage nurse asks if this is my first pregnancy and I tell her no, then she asks if I have any living children and again I have to say no