Not sure, am I pregnant?

Been trying to concieve since january, but have had irregular periods. They are finally starting to go back to normal. My last period started on june 4th, but it was like 8 days long. (yuck) I was unclear on when my ovulation time was. Im starting to feel a little nausea in the tummy and have had some really bad headaches. My stomach fells crampy, and my lower back really hurts. I'm also really bloated after I eat. Any ideas if this month will be it?? Thanks