So my head has been so itchy lately. My boyfriend just checked my head again for lice. He said he…

So my head has been so itchy lately. My boyfriend just checked my head again for lice. He said he doesn't see anything. I've gotten shampoo for itchy scalp and that isn't working. Idk if it's the weather or being pregnant or what. During the winter my head tends to get itchy but I associate that with the weather. So idk.