hj1981, hi there.. I really don't know what to do if you fall pg again unmonitored. Maybe you can get your GP or OB to run a progesterone test but they won't usually. Though having had 2 previous m/c surely they wil run some tests of some sort to check all is going ok.
It is a hard place to be in coz I would be in the same boat if this one sticks.
hugs
Judy