Craving For Brother's Burger

I'm now in my fourth month of pregnancy and I still have some cravings. According to what I've read, cravings would continue throughout the nine months of pregnancy. The other day, I was craving for Brother's Burger but I was not able to satisfy it because we were off to a Christmas party and the nearest branch is out of the way. My tummy ached when I was not able to eat the burger. I didn't understand it, was it really because of not satisfying my craving or was it just a psychological thing? Yesterday, I was craving for it again so my husband inquired if they deliver. Unfortunately, they could not deliver in our location. I thought I would not be able to eat it that day. I got a little depressed and my tummy ached again. My husband and I just looked for the Tomas Morato branch and there we ordered the much coveted burger. I was happy!