Symptoms or wishful thinking?

I'm about 3dpo. Sorry for TMI but yesterday I had some stomach issues. I just want to say I never get sick. I last went to a doctor in 2014. My coworker have gotten several stomach bugs and I walk out unscathed. Anyway, so yesterday I had the stomach issues and I read on another forum that a lot of women who had this issue, so soon after ovulation, were pregnant and that was their earliest sign. I have been experiencing sharp pains on my right side (ovary I think) as well as the occasional period like cramp. Nothing hectic. This evening I went to bed at 20:00 (now lying awake at 23:30) and I'm feeling a little nauseas. Don't know if it's because I'm tired or what. My boobs are quite sore to the touch only though. Anyway, do you think this is wishful thinking or could these be very early signs?