I believe my cat is about 6 or 7 weeks pregnant. The past 3 mornings she has been very playful Is this normal?

My cat has all the symptoms of being pregnant. Her are a rosy pink and very big compared to what they used to be. Her appetite has tremendously increased, most of the time she is sleeping, she is very affectionate. Lately she has been acting so strange. One miniute she is asleep on the floor and the next she is pouncing on my foot! I would just like to know if this is normal or if anyone else has expierenced this with there pregnant cats! Answers will be very helpful! Thank You