Ovulating or not

Hi girls, so all the apps that i use showed that i should b ovulating the week ending today.. so we madeout accordingly.. however i did not have the ewcm as its supposed to be.. i did have pre ewcm though, so dont think i would hv missed ewcm coz i was wiping tissue almost each time before i peed.. i also used opk since 18 th (once a day) but did not get any line whatsoever( i hv never got any line though even months prior to this). However yesterday for the first time ever i got a brighter than faint line at 2.30 pm but no line at 5.45 pm. Last month i think i had a chemical pregnancy (my analysis though, not sure). Do u people think that its possible that i did ovulate or not.. we have been ttcing 4 months now.