4 day light period

Iv got back ache cramps but sure this can’t be possible? My period due on the 30th I’m ment to be ovulating but the test never got very dark” positive” so I must be seeing things right? We use a condom every time .. only 1 occasion we thought one had leaked. It that was before the period from 1st-4th ,, opinions on what you can see 🤷‍♀️