Should I be concerned?

Hey guys,

I’m currently 28 weeks and this afternoon I’ve been feeling a bit off. Not like my usual self. I fell asleep after work which I don’t normally do, and since I’ve been awake I feel a tension in my head, like in my sinus region. I also have a slight headache and on and off I feel like my heart just starts randomly racing which has been happening for a while now. I guess heart palpitations. Should I be concerned? I just feel like I’m getting sick or could it be something else? also to add, I was recently told that I have low iron levels so maybe it has something to do with that? Thanks!