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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
1) Is your cat indoors only? 2) What color spotted did you see? 3) Were any diagnostics performed at that time?
With her being an indoor cat and the majority of the way through her pregnancy at the time of antibiotics, chances are she did not abort without you knowing it and she is still pregnant if she was pregnant before. With her being so close to term, if you wish to confirm pregnancy you can have x-rays performed within the next few days (we usually try to perform these 2-7 days before delivery) to confirm presence of young and also to get a head count for delivery.