Guilty and anxious about calling in

So I was curious what everyone thought about this. I am typically not one to call in sick from work, especially after my last job making me feel terrible about doing so. I checked and I have called in one a month since the beginning of my pregnancy (4 times since I'm 16weeks) because some days are just so hard, it's this excessive? My manager has not said anything to me about it but I still worry.