I'm 24, a step mommy to two beautiful little girls. My husband and I are trying to conceive. As of…

I'm 24, a step mommy to two beautiful little girls. My husband and I are trying to conceive. As of today I'm 1 week late on my period. I've taken 3 home pregnancy tests and all came back negative. there's no signs of it coming or anything. As of today my breast have been a little tender. I don't want to get my hopes up to high, for I had a miscarriage a year ago in March. I'm not sure how long I should wait to take another test?