could I be pregnant??

For the past month or so I have been trying to get pregnant. We have sex about every night sometimes during the day too (not to get pregnant but because we like it) and he cums in me every time. But I I have taken pregnancy test every day since 2 weeks after the first time and they all have been negative. Sometimes I get an invalid but mostly negative. Today I was suppose to get my period and I didn't. I took a test but still negative. When is a good time to take it again? After my period should be over? My body aches some what more my back and boobs and lots of fatigue and laziness but nothing else really I wouldn't even really associate that to a pregnancy. Please help. 😥