Warmth seeking coupled with inappetance in a ball female python that has locked several times in the past with a male are grounds to presume she’s gravid. A “lump” visibly can be the thickening that generally comes post ovulation. A ovulation, if you catch it, is unmistakable and is a pretty extra large swelling of the mid body. Just “building” typically refers to the maturation of the follicles and can be palpated but is for the most part not going to cause a swelling of the reproductive tract like a ovulation. Being egg bound however will surely show a heaviness and rounded appearance with some spinal prominence and tail inversion.
Stay in peace and not pieces.
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