Pregnant? Help Please ( advice,input needed)

Ok so just a little back drop its been 7 years since I have had my last child, in all those I have not gotten pregnant or a scare, etc, well in July and August of this year I had gotten my period on the 17th, after I had my last period in August well 2 weeks later I had like spotting ( compare it to when its like your last day or 2 of your period) and that lasted for exactly 3 days, well my app says I was supposed to get my period this month on the 12th. Nothing came so I thought okay well maybe I will get it on the 17th again because thats the date I have been getting the last couple of months, well now its the 20th & I still have no period no spotting not even signs of my period. I don't really feel anything. Please give me your thoughts on any of this??