I think my chart is off and ovulating early

Laura • I am 34 and have a 2 & 3yr old. DH and I struggled with infertility for several years and had a successful IVF with DD.
So I should do the ovulation tests but after years of learning my body I feel like I know when ovulating. I am not scheduled to ovulate till next week but have had increased CM and ovary pain today. Only on CD7 but better get BD'ing early just in case!!!