*crazy question* So we have been trying all month to get pregnant. Pretty much everyday/ every other…

*crazy question*

So we have been trying all month to get pregnant. Pretty much everyday/ every other day since the start of my ovulation. I took a pregnancy test the day before my period and it was negative so I figured I wasn't pregnant. But I was late which I usually never am so when I was 2 days late I took another one and it was negative. Now I'm 3 days late :/ is it possible to conceive close to your period that you skip it but your hcg levels are still too low to test??