Question: Previously I have had 3 children that are 12, 11, and 5 years old with no issues from a previous marriage, I am now remarried and have been TTC for 2.5 years. My husband has been tested and he has no issues with sperm. My tubes have been checked a year ago and they are open. I have been diagnoised with a very minor level of PCOS....previously we tried the 1st round 2.5mg femara no response, 2nd cycle dose doubled to 5.mg 3-7 -and it resulted in one mature follicle measuring 18mm..Progesterone was checked then checked 7 days after Ovulation and progesterone result was 18, Dr. said I likely ovulated on my own based on progesterone result and due to having no known ovulation problems.... I am currently on my 3Rd cycle of femara with timed intercourse, This cycle I took Femara CD 3-8, of 5 mg and resulted in 2 mature follicles seen in ultrasound that was taken 10/19/2015..which measured 18.2 & 18.7 one on the left and one on the right, I am on CD 13 today, . ....I want to know if a trigger shot would give me any benefit for conceiving or makes of better quality egg? or is it useless to me since I am already probably ovulatating on my own?
I also want to know since I have 2 follicles that are mature does that mean there is a chance of them to both release and possibility of twins?

Also i was told my lining is 7mm is this a normal range?

Just to make sure I am clear on your response, even though it's presummed I ovulate on my own, the trigger shot will enhance this cycles ovulation?

One other question I had, on what day of cycle is the trigger shot usually given???

Just to make sure I am clear on your response, even if it's presummed I ovulate on my own, the trigger shot will add benefits to the cycles ovulation?

Thank you for the clarification..

My last question is regarding the follocle size at trigger, I ran into a few forums online that say that the follicle size should be at least 20 or optimal 24.7 at trigger date? What is the best follocle size to do trigger at?