Ay sis, normal lang yan sa second trimester, hormone fluctuations kasi talaga ang culprit, pero kahit gaano ka-common, better to check with your OB just to rule out anything else, especially if it's on one side lang like yours! A few of us preggy mums also noticed it gets worse pag stress or nakatingin sa phone too long, so try mo muna mag-rest ng eyes, drink lots of water, at maybe warm compress sa area na masakit, pero best talaga na i-mention mo sa doctor next checkup mo para peace of mind mo.