Ovulation questions

Kara
So my cycle is about 30-31 days. My original date of ovulation showed this Monday the 28th. I took an ovulation test Friday and Saturday and both came up low on the clear blue tests. I have never been able to get w positive but my cycle is regular. Im new to this app and logged that the ovulation tests were negative and now it's moved my ovulation date to Wednesday... Is that because I logged the low ovulation reading? We've only been trying for 6 weeks but im just so anxious to get pregnant. Do people get pregnant and never test positive on an ovulation tests?