Just in case: Daily Mail are scum.
DP and I are recently engaged 
We have both always imagined having a “proper” wedding - nothing fancy but all of our family and friends invited to a ceremony, sit down dinner and then dancing. This is partly because we love a good party so would love to throw one, but also mostly because we both love the idea of having all of our loved ones in the same place for a day and we are aware this is unlikely to happen otherwise.
Unfortunately, we are pretty much the last ones in our friendship groups and families to get married (met each other a bit later than would have liked to). The majority of our friends got married last year/this year and this means that lots of them are planning to get pregnant over the course of the next 12 months. In particular 3 of my closest, oldest friends, who I would want to be my bridesmaids (I was all of theirs) and who I would be gutted not to have there on the day, are likely to start trying in the next couple of months. This means due dates from end of July to Christmas next year assuming it doesn’t take them too long to conceive.
For work reasons DP and I can’t get married in April or May. We have found a venue we love (after a fair amount of searching for something suitable within our budget) but it has no availability from June-Aug next year. So that means getting married either in March, which feels very soon and like everything would be rushed (we haven’t picked anything yet) or in Sept/Oct/November, which would give us plenty of time but would mean it was very likely that at least one, if not all 3 of my closest friends would either miss the wedding entirely or really not enjoy it with a tiny baby to look after. We don’t want to wait until 2021 as we’re already a bit older than we would like and don’t want to put our life on hold.
DP would prefer to go with next autumn as he gets quite overwhelmed with rushed planning and trying to pack too much in. I agree with him that it would be a shame to rush one of the biggest days of our lives to fit around our friends’ life choices. But equally I would be devastated if my best friends missed the day (and it is likely that a lot of other guests would also be in a similar position). I can’t see the point in spending all the money and all the time planning an event for our loved ones only to have those who are most important to us missing it (although I am aware it might take them a while to conceive, it also might not!)
We are stumped. Has anyone else been in this position and if so what did you decide to do? Should we rush ahead and get everyone there but probably have a stressful lead up to the day? Or take things at our own pace but risk lots of no-shows including my closest, oldest friends? 
WWYD?