Barometer Pressure..

How much does it affect a pregnant cat?

Our barometer pressure has just started dropping today and my preg. cat is acting different..

will this cause her to give birth tonight?

No doubt changes in weather affect living organisms. I have some health problems that are affected by weather changes. But I think it's more than just barometric pressure. I suspect your cat is acting different because she knows the time is near, not just because of the weather.