The idea that the birth pangs cannot happen except during the final seven
years is an interesting one, but I believe the argument is weak and not at
all compelling.  Gestation periods  notwithstanding, the only thing that
matters is what the Scriptures say, and I see nothing in the Scriptures
that totally confine the birth pangs to the final seven years.  I could be
wrong, but as with Perry Stone, Jr. I believe "the beginning of birth
pangs" may begin before the final seven years (where we are now), and
increase during them.

Also, of a 280-day gestation period, it is only during the final few hours,
maybe 1,4, 6, or maybe slightly more hours, that "birth pangs" are
experienced.  In a 280-day period, there are 6,720 hours.  If birth pangs
are experienced only in the final few hours of the 6,720-hour period, that
further weakens the argument.  I do not see how this could have relevance
to the seven year Tribulation.

However, there is one possibility.  Could the few hours of birth pangs at
the end of a 6,720-hour gestation period be proportional to the final seven
years of a 6,000-year period?  It comes out close, I believe.  That is an
interesting thought.

Jim