Hoping for Baby

My husband and I have been trying to conceive for about a year now. This would be our second pregnancy, unfortunately our first one ended in miscarriage. We desperately want a child and I just recently started really charting my cycles and trying to determine when I'm fertile. I was supposed to get my period July 26th, took a pregnancy test the next day it was negative. My last normal period was June 28th, my ovulation date was July 15th. I got my period but it was only 2 days and the first day was bright red, second day was a lot lighter, then it stopped started again and stopped again. This is not normal for me. I have also been experiencing nauseousness, dizzy spells, runny nose, cramps in lower stomach and pelvic region, change in appetite, mood swings, extreme tiredness and sore breasts. I have been doing research about decidual bleeding and not sure if this is what happened to me or not. Has anyone else out there experienced this and if so when should I take another hpt? P.S. if it helps anyway I am 25 yrs old, work part time and attend college full time.