6 days late is pretty late so you probably will want to go take a pregnancy test if your period doesnt come by tomorrow. Just remember that even the pretty good over the counter pregnancy tests aren't always super accurate this early!
You probably wont get all the pregnancy symptoms this early, alot of those won't show up until later - so for now its probably best that you go take a pregnancy test
One other thing - as someone who experienced a teenage pregnancy before - please know that no matter what its going to turn out ok. Pregnancy can be a beautiful thing. Don't pressure yourself to rush to a decision on abortion. Really. Abortion is a much much harder decision than most people want to admit. As someone who had an abortion as a teenager. I can tell you that I thought it was the right decision at the time - and I have spent most of the past decade regretting it terribly.
You will know whats best for you hopefully. I thought an abortion was the answer I was looking for and looking back on it, I know that abortion was wrong for me. I should have taken more time to think about it.
Best of luck to you! If you are pregnant thats a wonderful blessing!
So, remember that an app is just an estimate of when you'd get a period ordinarily. It doesn't measure hormones or things going on in life like stress, changes in routine, weight gain or loss, illness, etc. :>) So, it's just going to average from when you normally get a period. Every woman will be late from time to time even if it is not their norm. Most of the time they aren't pregnant.
Since you had his penis inside of you, you can test to rule it out. Tests are typically accurate at 2.5 weeks after you've had the episode you are worried about.
And remember that pms can cause symptoms too and they might be like what someone says makes them worried about pregnancy.
So take a test to know for sure. If it is negative, you can wait a full week. Your period will probably show up then or take another test at the end of that next week. Let us know!