Different bbt chart this month

I had my first iui last week and I've been bbtemping for the past few months... Just to verify ovulation because I have PCOS. Normally I have a large temp shift when I o... The past 3 months the shift looked pretty much the same. This month though, it's a slow rise. It looks so different from the past 3 months. I don't know if it's because I did a trigger shot to o with the iui or if it may be an early pregnancy sign. Has anyone else that's gotten their BFP and temped had their Prego chart look differently? I'm only 5DPO right now. Thanks for any insight!!