If you have still a month can you not apply to get married asap you may just squeeze it in.
If im not nosey why is the reason you can't marry, while pregant?
A lot of us had to alter our plans for our weddings due to logistically problems or what have you. It may not be the ideal signing of the paperwork cermony, but sometimes needs must.
TO make matters easier we had cvil wedding with Blessing afterwards by my Wifes Lolas vicar which was very moving and great for the weddings photos.
Im sure the bloke up in the sky will not be offended.
