This is my 1st IVF too. I had 2 embryos (5day transfer). I had bed rest for 2 days then went to work. I didn't feel much but on day 6 post ET I started feeling bloating, period cramps and saw light dark bleeding that continued till today which is my day 15. I tested 3 times with HPT and all were positive, I did my 1st Beta and confirmed pregnancy levels 79. I am waiting for my 2nd Beta levels today. So if you feel any of the signs I felt don't worry there's still hope you can be pregnant and if you don't feel any signs or symptoms, you could still be pregnant, really you can't do much during your 2WW except chat with our good friends in the forum and hope for the best. Good luck to you and baby dust your way!
After my cycle, I felt bloating, cramping, and gassy. These are my usual signs of AF coming. The medication's you are on also can make you feel this way. Don't panic, you shouldn't be getting you period this early anyway you are probably feeling implantation, or your ovaries trying to get back to normal.
Did you get the two day complete bed rest after the embryo transfer. May be you might be feeling uneasy. This might be the implantation. Don't stress out, relax wait for few days. You should feel better. Good luck.