Should I jump to conclusions

Me and my husband are trying for a baby and I’ve been on top of my PMS symptoms for about 6 months now and have kept mental notes of my body in general. I keep a close eye on what I eat because I have emetophobia so when I was nauseous a few days ago alarm bells went off in my head. Since then I’ve had on and off mood swings throughout the day and nausea at 5pm on the dot. I took some tests today that showed negative but later I’ve had brown discharge (sorry for the TMI). Im positive it’s implantation bleeding. I’m 3 days before my period but I’m always 2 or 3 days early and I always have really painful cramps a few hours before and a heavy bleed the same day. With lack of my regular symptoms and all these new ones happening I feel like I’m going crazy when the tests are negative.