Confused.

Gina
TTC baby number 2
3 year old daughter 
Both in our 20s
Non smokers, non drinkers. 
According to my period tracker I'm next due on 1st July. (My periods are extremely irregular and I had coil taken out in march) 
I bought some ovulation tests because I was extremely upset when my period came last month so wanted to take one a day so I knew when I really was ovulating. All was negative until 1st June.
If I ovulated 1st of June surely my period can't really be 1st July? 
I don't understand what's going on?