Cycle confusion

I had a positive opk on the 13th, on the 22nd I went in for a scan which was supposed to be a baseline even tho my cycle wasn’t due until today. I had some pretty big cyst that they said were active so they had me trigger on the 22nd to dissolve those cyst before my cycle started. The nurse said I should start my cycle on the 5th. I asked and double checked because I had a positive opk on the 13 which would have me starting today. She said I wouldn’t start til about 2 weeks after the trigger. Ok so today I’m 6dp the trigger and it has tested out and I’m really crampy. I’m really regular and pretty In tune with my body and I feel like I will start later. Do you think it’s possible to still start scoring the opk, or the nurse is correct I won’t start til around the 5th because of the trigger? Has anybody had something similar? This is my third ivf cycle and it has been completely diff, I had one successful with my now 18month daughter, second one failed last month it ended in a chemical.