AF DUE TOMORROW

So tomorrow my AF is due and I'm so scared... I've gotten some constipation... and some flutters on two different days.. I took a pregnancy test two days early and it came back negative... and I know you're not out till AF comes but this is month number four... I feel like something is different and I think it's just me being "positive" (attitude wise) and I'm breaking out like I do before my period comes... please tell me this doesn't mean I'm out... really need a positive success story!