Confusing cycle

So this is my first month off birth control in years, TTC for baby #1, and I swear my body is going crazy readjusting itself to my natural hormones. I ended my last period on May 25 and according to glow I ovulated June 4th. Since like the 2nd my nipples have been so sensitive and the past two days I've been experiencing cramping and light spotting. I've never had cramping or spotting while not on my period before. I feel like I'm on my period now but there's no bleeding and it's technically not due until the 18th!