Bloating after IVF egg retrieval?

Laura • Unexplained infertility. Both 32. TTC 5 years. July 16` IVF w/ICSI. Aug FET #1 BFN / Sept FET #2 BFP!
How bad will the bloating be after egg retrevial? I ask this because as vain as it sounds, I have a wedding to attend a few days after the expected ER date.  I already have a dress picked out but it's more form fitting.  It's a in law family wedding too so I'm terrified of looking pregnant when I'm actually not :(