<s>[INST] Hello! I took clomid on CDs 3-7 for ovulation since I have PCOS. I did an ultrasound yesterday on CD18 and had 1 follicle that was 15mm. It seems to be growing on average of 1.25mm a day. Well wed. my OBGYN wants to give me a trigger shot. If my follicle keeps growing at this rate it will be only 17mm. Would that be large enough to produce a viable egg? [/INST] Hi welcome to hcm.I have gone through your question.Follicles generally need 17/18 mm size to get rupture, so 17 mm size will be idle to get rupture.Hope i answered your question.Would be happy to help you further.Take care. </s>