Sugar rush

Sara • Hi ladies im a mother of 3 little girls and im pregnant with baby #4 . Im stay at home mom and i just hope for the best ❤👶
Now that im preggers i crave sugar more than usual. And ive notice that before i have my sugar fix i feel very slugish and i also get headaches i know it's normal to feel like this while pregnant. But once the sugar has hit im ok the rest of the day. Could it mean that im low on something ?