I haven't gotten my monthly which is weird. Yes I have heard that it can change but this never happened to me before. I'm also aware that sometimes pregnancy tests can come out negative but you'll still be pregnant.

So as we all know the red circles means I was on period for those days. I had sex on the 6th and 26/27th of October. I took a pregnancy test this week and last week and it came out negative. The app says my period is 19 days late. Any thoughts ?