<s>[INST] Hi I had a follicle of size 18mm on day 7th,. Is it necessary for taking injections for follicle size and is it also necessary for trigger? Without these injection is there any natural way to increase the egg size?My age is27, weight is 75kg,height is 5.3 .I got all my tests(blood tests7ultrasounds) cleared getting nothing wrong & all is fine. Considering my case, when will I be ovulating approx? Kindly reply. [/INST] Hi welcome to Chat Doctor. I have gone through your question.18 mm follicle size is about to rupture within 2/3 days, ad follicles generally rupture at 20/22 mm size, but you had this size on 7th day is slightly contradictory. I would advise doing follicular scan to follow up for follicular rupture. Ideally at this size no injection is required to rupture follicles. But if there is tendency of follicles converting to cyst in past cycles then it is necessary. So consult gynecologist for further treatment. Hope I answered your question. Would be happy to help you further. Take care. </s>