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This sounds as though she could have had a bacterial infection as some are hard to detect or it could be pyometra and I would suggest that you talk with your veterinarian concerning this. If her temperature is very low at this point she is close to delivering so be prepared as a lowered temperature means that she could start whelping at any time now. The avergae is 63 days but can be as soon as 58 so I would relate the drop in her temperature to the pregnancy but feel you should give your veterinarian a call and discuss this possibility with them but that should have showed up when they saw her. If she is showing no signs of illness right now except the lowered temperature I would continue with the Clavamox and give your veterinarian a call and see if they feel pyometra as this can be very serious but the fact that the antibiotics helped with the symptoms the first time around is a good sign but it is better to be safe then sorry.