TMI pregnancy confusion

Okay so me and my husband have been trying for 6 months now I'm 17 he's 19 please don't criticize I'm moved out we live together both graduated and have a steady paying job me and him have been together for 3 years now we recently decided to try this year and I have irregular periods but I watch for my most fertile days and I usually watch for my CM so I know if I'm more than fertile so we tried 07/04/17 and I took a test 07/15/17 and it came up negative was that to early to even tell but I'm 2 days late on my period as of today and I've had brownish reddish discharge and I've been sick since my birthday 07/17/17 I've slept almost all day for past three days not feeling good I get really nauseated but I don't puke and I don't really get hungry I'm confused on what this could be or mean help me please