It has an impact. To be precise, female cats suffering from pyometra will not become pregnant. Pyometra is infection and swelling inside the uterus of a female cat. The chance of a female cat suffering from pyometra becoming pregnant is very small. However, if you find that your pet has pyometra and is pregnant, please be sure to do so as soon as possible. Seek medical attention to prevent the kitten from failing to grow and causing fetal death, which may affect the older cat.