I know the answer will be to just wait and see but I have never been good at that bit.
I had a miscarriage in jan and since then my cycle lenth has been getting shorter each month all the way from 59 days. Last month it was 29 days and I assumed that it was finally back to normal as my usual cycle pre miscarriage was 30 days. I am now on day 34 and no sign of af and had a bfn on sat.
I did have bad heartburn on sat night and only time I have had that before is when pregnant but other than that no symptoms.
I really can't suggest anything else apart from wait and see! Do you have any idea when you ovulated? If you know, and it is more than 15 days ago, you should almost definitely get a bfp if you are pregnant (and a bfn if you are not). If you don't know then you should find out one way or the other by the end of this week. If you still haven't had a period by next monday, a trip to the GP might be in order.