FEELING DOUBTFUL any insight?

So Ive been using the glo app for almost a year now. Was only on BC for 3 months, started last year end of Oct-Jan. Hubby an I have been having unprotected sex up until now but have been trying to watch when we shouldn't have sex. In other words not near ovulation. The thing is according to glo we've had sex 3 days before Highest rate of conception about 2-3x in the last 3-4months an I end up getting my period an when I put my period date my ovulation date changes an it's really pissing me off. I don't want to do a Ovultion Test cause I don't want spend money. But it's a little sad in the sense that I haven't been on BC for almost 8 months an still not baby 😞 I've been pregnant before. Almost 3 years ago. Was never on BC when it happens the first time but it's annoying in the sense that with only having been on it for 3 months I'm still not pregnant. Or glo isn't getting my Ovultion date correct.