Sometimes snakes will release follicles from one ovary and later release follicles from the other instead of both together, so in essence I guess they can ovulate twice in some instances.
Another reason for seeing swelling in a female snake is during vitellogenesis. During this time the females body is producing yolk for the follicles and as the follicles fill up with yolk it can cause some visible swelling.
Congratulations, it looks like you're going to be a snake parent
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