Hi,
Thanks for the query.
Emergency
contraceptive pills will have high dose of hormones compared with regular contraceptive pills.
Repeated usage of emergency contraceptive pills can lead to problems like
hormonal imbalance, menstrual irregularity etc.
For more details : http://srsree.blogspot.in/2012/08/emergency-contraceptive-pill-short-term.html
The usual recommend gap between two emergency pills is two months.
As you are not having menstrual irregularity, there may not be any problem for
fertility.
As you have used the pills for longer period, better to avoid emergency pills from nowonwards.
You once go for
ultrasound to check the uterine size, endometrial thickness, ovaries etc.
Then track the ovulation in next cycle and plan intercourse around that period.
This will increase the possibility of
pregnancy.
Take care.