Estrogen level when stimming

I started stimming on January 1st (150iui of Gonal-f and 2 powders of Menopur each evening) and went in today after 4 nights of stimming to have an ultrasound and bloodwork. I had 10 follies on the right and 10 on the left but they were still small. The largest on the left was 8mm and the largest on the right was 7mm. They called me back a few hours later to increase my dosage to 225iui of Gonal-f and 3 powders of Menopur because my estrogen level was 157. Is this bad? I'm getting worried. Does anyone have any experience with this? I just want this all to go right. This is my 1st IVF. Thanks in advance 😊