Unsure due to change in cycle

Ok, so my period was late last month due to vacation and traveling through time zones.. (I'm assuming why it was late, was not pregnant last month) I did get it on July 4th for only 2 days (normally its 3-4). My husband and I are TTC this month, and I'm concerned whether or not we hit the right days because my cycle was off. My cycle should start on August 1st not August 6th like the app says, because it adjusted to my last one being late. So I'm wondering if I am pregnant now (I've felt very nauseous and dizzy the last two days, along with being ultra sensitive and extremely moody). Should I test this week or try to patiently wait until August 6th? Any thoughts?!?!