Other reasons for sudden nausea?

Jasmine • Mommy to two (one on the way 8/11/19)💕 YouTube 🎥 21 Years Old 🌸

This is the second time this week I’ve just randomly became nauseas? My mind goes right to being pregnant but I really doubt I am. I’m 3 months pp, taking the mini pill (I take it everyday at the same time) also my fiancée and I have probably only have done it like 6-7 times since I gave birth and all of those times he pulled out.