Very early ovulation

Hi! So my last period ended on the 26th and yesterday i felt a bit weird so i decided to take a LH test and it came out a peak (both a strip and the clearblue digital), and also today i tested three times and they all came out positive, but i'm only on CD 13 (that makes yesterday CD 12) ... is it normal to ovulate so early since i usually ovulate on CD 16-17? I also had my second dose of covid vaccine yesterday morning, but i already felt 'weird' the day before.