If your in heat female cat got out and bred with a male cat it is likely that she is pregnant. If this just happened I would have your cat spayed immediately by a veterinarian. There is a major problem with feline overpopulation--the shelters are over-full with cats. Every time your cat goes into heat she will try to get outside and the male cats will try to get into your house to breed her. The most responsible thing to do is have her spayed. Many shelters have low cost spay/neuter clinics.
Contact your veterinarian to determine if this cat is pregnant. Gestation (pregnancy) lasts on average 63-67 days. Fetal vesicles can be palpated as early as day 21-35 following conception. Ultrasound is the earliest and most reliable way to diagnose pregnancy. The fetal skeletons calcify as early as day 38 but more reliably a few days later. At this point they can be seen on x-rays.
Contact your veterinarian to determine if this cat is pregnant. Gestation (pregnancy) lasts on average 63-67 days. Fetal vesicles can be palpated as early as day 21-35 following conception. Ultrasound is the earliest and most reliable way to diagnose pregnancy. The fetal skeletons calcify as early as day 38 but more reliably a few days later. At this point they can be seen on x-rays.