Third trimester nausea???

Kelsey • Kelsey. Married. 20. Gave birth to my first child July 3, 2016
So for the past week or so (30 weeks 1 day today) I've been randomly getting nauseas in the afternoons. I already take meds for nausea one in the morning and 2 before bed but I'm wondering if I need to add a 4th during the day. Did anyone else get third trimester nausea??