Congrats on the upcoming wedding.
I would agree with everything that everyone has said:
You can't be that precise in timings, it is normal for any couple for it to take 6 months to conceive. Add in the pill aspect and this can increase the expected time to conception too.
I got married at 34, but we decided to wait a few months after the wedding before ttc to give ourselves some time together as a married couple first.
TTC can be stressful as can getting married, so combining the two can double the stress. Coming of the pill can mess up the hormones and you will start experiencing hormonal changes during your cycle that you have not for a while, this in itself can be difficult without ttc on top.
Whether you stop the pill before or after the wedding is a personal decision, I preferred to be on honeymoon enjoying all the fun, but as it turned out I was sick and so the pill was not effective, we messed about with condoms as we were not ttc, but if a honeymoon baby had occurred it would not have been bad either.
When I did finally come off the pill we were travelling to Australia and the hormone shift and being away from home was interesting!
When we stopped the pill we started ttc straight away, and it took 4 months, I had my first child just aged 35. I had my second at 36. I started having issues conceiving at age 40.
Out of curiosity why would you ban sex if you came off the pill before going on honeymoon, you can have sex while pregnant still if that is what you are referring to????
The pill can take up to three months to be out of your system, but some say that it is possible that you are more fertile during those months....
As for risks in early pregnancy.... in the first few weeks the placenta has not taken over, so there are few risks. Miscarriage may occur for genetic reasons, but very little will shift a good egg. As a recurrent miscarriage sufferer I have looked into causes. Sitting on a plane for many hours during pregnancy puts you at risk of a clot, but you can use compression stockings and try to walk around and move your legs as much as practical.
As for being the youngest in the year - well unless you are going to put off ttc for a few months each year you are trying, there is no other way of getting around this. But at your age, I would say this is the least of your concerns, and you can get around various disadvantages which will not necessarily happen, as it is not all summer born babies that suffer the things you mention, just some.
Please please please try to keep ttc as much fun for as long as you can, stress does not help with ttc or early pregnancy. Try to remember the normal timeframe is 6 months to a year to conceive, it can take a shorter or longer time, but that is the normal length of time.
I hope it all works out fabulously for you what ever you do.