Laki, sorry to hear that. I can imagine what a disappointment it is because we are so mentally prepared for it. Maybe it's not confirmed yet. You still have from now until your ER to manage this, right? Did the doctor lower your dosage? And give you any advice to avoid it?
In the meantime, feed your body with lots of protein and water.
Also, maybe talk to your DH about your feelings and start to mentally prepare for your next cycle for ET, if it really must be delayed. This way hopefully you will feel better. Trust your doctor to make the best decision. You want your body to be at the best to receive your egg. Hugs!
Nicxl, maybe you can use that appt to talk to your doctor about the plans for your next steps. But like what Saralyn said, what day DPO are you? It could be implantation bleeding!
Emily, just be as healthy as you can. Eat well, balanced diet, no caffeine and exercise regularly. Other than that, is mental preparation, i.e. manage your stress level and stay positive!