hey guys, I need help!

so, I have an irregular period. I've been tracking my cycles on glow for quite a few months. occurring to glow I was supposed to get A/f June 16th (my borthday, ew), but it never came. on the 14th my fiance & I had sex. starting yesterday my nipple have felt very sore & seem to get even more sore. I've felt so insanely tired lately, but I just started a new job so I feel like my exhaustion is from that. & I kinda feel like I've been moody.. I've taken 2 tests & gotten BFN both times.. what do you think I should do now?