Hi, me and my husband are trying for our first kid . My period cycle is always 28day. My last period was on 6th November and we have trired on 10/11 day. My period was due last Monday (3rd December 2012), for the past 1 week I ve been very bloated have lower back pain , cramping, tiredness. I took the first response hpt on 9th December, but it came out negative. What should I think?