My endo specifically told me that I could take one dose in the am and one in the pm, both in the am, or both in the pm, it really made no difference. She emphasized this in contrast to the estradiol, which she definitely wanted split between am and pm.
However, you ought to check with your own doctor asap just to be sure. He/she may know something about your situation that we don't. However, I will note that on my spiro datasheet, it says to take a missed dose as soon as possible, unless it is nearly time for the next, in which case to skip it.