Hi mel - I hardly ever come on any more, but I saw your post and had to comment. Firstly, hugs - I know how absolutely terrified you are just now. I went through almost the exact same thing.
We did IVF, and at 8 weeks (I had no symptoms at 8 weeks either BTW. I started chucking pretty soon after though

) I had a massive bleed. Bright red blood, and a whole lot of it. It continued through the night and into the next. Pain and blood isn't so good - I had cramping I think from memory at that stage, but when we did a scan (to confirm miscarriage), the little ginger was there, happily bopping away, and he's still driving me mad now
Please, please try to be as calm as possible over the weekend. Take it as quietly as you can - let everyone take over for you until you can get into the clinic for a scan on Monday.
Don't forget what your body has been through - your hormones have been screwed with, your bits mucked around with, and you'll be a bit battered inside. So many times, I would curl up under the shower in the wee small hours trying to breathe through the horrendous cramping and pain I was in (I had cysts on my ovaries after the IVF as it turned out but it felt like my insides were coming out).
Ah crap. My littlest is cutting a tooth and is yelling ... gotta dash!
Last instructions - feet up, take it quietly and try not to get too upset until you can see a Dr. Once you've seen a heartbeat, the chance of miscarriage is reduced to something like 5%. Crossing everything that it's just your body noting its displeasure at the fertility treatment xo