Could I be pregnant?

Hi! Just wanted to get some thoughts from  other moms.  
   My last period was May 27th. The last time we had sex was before my last period. It was during my ovulation window, but then I had a normal period, so I figured there was no way I could be pregnant. We haven't had sex since then bc my husband has been traveling and we are trying not to get pregnant until after our trip to the Dominican Republic in a few weeks (Zika).  
Around 6/15, about 10-11 days before I was supposed to start my period I had some bloody discharge and some light spotting. Not normal for me.  
My son turned 1 in April, and my period started back after having him in January. I guess I could still be regulating??  
Now my period is about 6 days late. I haven't taken a test yet. We are at the lake this weekend and not around any stores where I could go buy a test.  Do y'all think it's possible I could be pregnant after having what seemed to be a normal period in May?  Thanks!