Question

This will be my first time pregnant and I honestly don't know what to do...
​I was late starting my period. Was supposed to be April 19...
​Had a no show until April 23... Had some brownish discharge then later that day when I wiped it was red.
​Today feels like a period I'm wearing a pad. It's not feeling up but it's red some very tiny clots that just smear on the toliet paper when I try to get a closer look 
​Took a pregnancy test on 4/23 and it came out negative however I didn't take it first thing in the morning.
​My back hurts on one side, nipples hurt when my husband touches or the water in the shower flows on it. 
​Not nauseated until right when I'm about to sleep and I have to get up and walk before I vomit.
​So when should I take another test and what's up?
​Thanks!