When should I test?

Hello everyone,

This is very new to me never posted anything before but here we go. I have been very sick lately with Extreme nausea and throwing up for the past 3 months. Doctors are trying to figure out what's wrong. Before I got sick my husband and I were trying to convince and put it on hold for my health but just using condoms. Well New Years eve came and my husband had some drinks and I didn't pay attention was pretty tired and didn't put one on. So now my period is supposed to start on Monday. Should I test now or wait? I can't tell my symptoms part from what I have been feeling lately but definitely more emotional and my boobs are starting to hurt a lot more than usual. Any advice would be helpful. Thank you in advance