I'm pretty sure it just means she is pregnant!
There are so many "old wives tales" but none of them work. Where the baby sits, how it moves, amount of morning sickness, cravings she gets... and the list goes on. My mom had morning sickness like crazy(according to dad) when she had my brother and I. She craved ice and snow ( to eat) when with my bro, and his feet have always been cold, other than that, good luck!