Hi, is it normal to have a light period if you missed your last one due to stress? My last period was the beginning of August, with no period in September, and have taken about 5 pregnancy tests since then, the last one on October 5th, and all have come back negative. The last time I had unprotected sex was early to mid-August. If I was pregnant would the test come out positive by now? I started what looks like my period yesterday, but the blood was very dark, almost black, which I've never seen before, and not very heavy. Can I contribute this to the fact I missed last month or is something else going on? Thanks!