Nauseous for two days straight before period- normal??

I haven't got my period yet (<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> says it's supposed to come tomorrow) but I've been super nauseous all day for two days straight now and it's so annoying. I haven't actually thrown up and I can eat and keep everything down but it's more of a feeling in my throat than in my stomach, almost like tightness. It's hard to explain. I don't think there's any chance that I'm pregnant because the last time I had (protected) sex was mid-April and I got my period a week or so after. I just feel kind of icky/sick overall but I highly doubt I'm actually sick because I have no fever, no actual vomiting, no bathroom issues, etc.