Please help! When should I get a positive pregnancy test?

I have very irregular periods so I'm having a hard time figuring out when to test. I usually have 22-32 day cycles but recently they have been lasting around 24 days. I had sex once this cycle with my husband on January 27th after I got a positive ovulation test and we are ttc so we used no protection. We are trying to conceive our rainbow baby so I can't help it but I have been taking a massive amount of tests. They are all different kinds and I am pretty sure I have seen very faint positives on all of the tests I took but the lines are so faint that I can't tell if they are indents or not. I'm not sure if I'm just testing too early, I am only on cycle day 18 out of 24. Thank you for all your help in advance!