What would cause a slow BBT rise? I had a LH surge my last cycle, then a couple hours later did my trigger shot (per my RE) but my BBT didn’t rise for 4 days after that. Ovulation occurs 24-48 hours after a trigger and I started supplemental progesterone as an insurance two days post trigger. This is skin temperature so it looks lower than oral or vaginal methods. I’m just wondering if it takes a few days? I always assumed it was quick to rise after ovulation.