Hopeful but realistic

So my boyfriend and I have been trying to conceive for over a year. I have always struggled with irregular periods and was previously diagnosed with PCOS. I do have a son (not his) who will be turning 4 this year. When I became pregnant the first time I had lost around 60lbs. I gained 90lbs during my pregnancy and only lost 15 of that. I have a feeling this is the reason why I haven’t been able to conceive. We have been following this app and trying to go by the ovulation dates on here. (No I don’t do ovulation tests). Anyway, I randomly decided to take a pregnancy test this morning and I didn’t have an immediate response but after about 5 min I saw an extremely light line. Is this my eyes playing tricks on me? Does anyone else see it? This is an early response test and because of being soo irregular I don’t know if I actually ovulated today like the app says or a couple days ago so I don’t know how many dpo I am.