Ovulation not sure if it already happened or not

Hi i just had AF from the 4-7 i took an ovulation test while on it and im pretty sure it was positive but glaow says my fertike window started the 12 and ends the 18 last night i had a close positive and now this morning the line was faint again. The opk im using say not to read them after 5 minutes and all were read with in that time frame. Glow says my most fertile day is tomorrow ant opinions would be appreciated but please no rude comments