I had the tiniest bit of spotting when my period was due, i'm talking very very minimul and of course me not expecting to be pregnant was praying it WAS my period taking it's time...not so.

I had a period which turned out to be an implantation bleed so before I knew it I was 7 weeks pregnant and have had no troubles since except some pretty bad cramping which doctors tend to get worried about. My doctor said you are able to have a u/s to confirm if the pregnancy is still viable or not due to people have missed m/s.

Good luck!