Pollinating flowers to obtain seeds, whether by using flowers from the same spike or a different plant will not weaken the mother plant if the mother plant is otherwise a healthy plant, and if there are only a couple pods growing. I could imagine that the mother plant would weaken if it has to sustain a many pods at once.
As to the fertility of the resulting offspring, that depends a lot on the parents. If you inadvertently cross a diploid (2 copies of the chromosomes) with a tetraploid (4 copies) then the resulting offspring is sterile. But generally this shouldn't be a problem.
A completely unrelated question: I see that your posts come from 2 different accounts. Are you having trouble with your original account? If so, please send me a PM and I can see if it's possible to merge them into 1 and help you sort out whatever issues you are having.
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Camille
Completely orchid obsessed and loving every minute of it....
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can you cross two flowers on the same flower spike, Brassavola
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