You will not always see lock especially at the beginning or even see any at all, you will however see other signs.
As far as keeping them together or separating them if the time is up depending on how you pair your animals just separate them until you pair them again next time.
To give you an idea I pair two days at the time and do so once a month twice if I do not see anything encouraging.
It takes a while and several pairing usually not much is going on with the first pairings unless your female is already developing follicles when you first introduce the male.
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