Questionable ovulation

Allison • 26. Married for 4 years. 22mo 👦🏼. 1 angel baby 👶🏼. 🤰🏼🌈 due in Nov2018
So my cycles are pretty normal..between 29 and 30 days. My last period was May 14. I spotted on May 24, but I'm unsure if that was ovulation spotting or what. I've been testing since then and have gotten negative (mostly really light second lines). I can't figure out if I've already ovulated or if I'm still waiting this out. Any advice??