No period and negative test?!

[Aikko]

3 days ago when I used the RR and wiped there was light brown/pink on the TP but nowhere else. That night I had mild period cramps and felt very nauseous so I just brushed it off and went to sleep. The next day I put on a pad because I thought forsure I'd start and while at work I rushed to the RR because I thought I did and there was only a little light brown/pink color blood in my pad. (Only like a streak) Also had lower back period cramps on and off that whole day. I haven't felt anything since! I've felt a little nauseous but nothing to complain about. No more spotting or cramping. I don't feel pregnant at all and I also don't feel like my period is coming either! I feel perfectly normal! I took 2 HPT before the spotting and was all negative. Has anyone else every experienced this before and if so what happened?!