Should I give in and test?

I have been avoiding testing. My mother says I should just let nature take it's course. AF is due tomorrow or 6/16. I had an extra rise in bbt this month which is abnormal. I haven't been able to sleep or lie on my stomach for 4 days because it makes me nauseous. Tonight the nausea started around 6. I thought I mine need to eat but that did not help. I've had 2 dizzy spells this evening after eating a full dinner. I've also been bloated all day. I'm not sure what to think. I was determined to wait but my trip to England keeps getting closer. What do you think? Should I give in and test?