FPS won't match on export

Hi guys,

All my clips and sequence is at 14fps, however on export there is obviously no option to select 14fps (15fps being closest) and match source puts it at like 14.87 fps.

So when I export the video it is duplicating one frame every 14 frames or so and it looks like a tiny lag spike.

Thanks! I think in the future I'll just have work at 12fps or 15fps, I don't believe there's any fix for this but thought I'd double check.