Can i really be pregnant? seriously what are the chances?

I did this on Web MD and I heard its pretty accurate. I put in the first day of my last period and this is what it said. I had sex twice on the 17th where my guy came in me.

15 cycle day: 15

A little fertile.

16 cycle day: 16

Fertile....

17 cycle day: 17

Really fertile.

18 cycle day: 18

Really, really fertile.

19 cycle day: 19

20 cycle day: 20

21 cycle day: 21

22 cycle day: 22

23 cycle day: 23

Implantation day.

24 cycle day: 24

25 cycle day: 25

26 cycle day: 26

27 cycle day: 27

28 cycle day: 28

Earliest positive blood test.

29 cycle day: 29

30 cycle day: 30

Earliest effective day for home pregnancy test

If you had unprotected sex, you CAN be pregnant. I don't care what that chart says. a lot of people forget when they are tracking their ovulation, that it can be off by a couple of days, plus sperm can live in the vagina for up to 3 days.

Take a test when your period is due, whether it comes or not. Bleeding does NOT mean that you are not pregnant.

That ovulations calculator thing is pretty accurate thats how I figuered out when I consived this pregnancy. I thought I was just off a couple of days but this really helped. Since sperm lives for 3 days your probubly prego cause you were most fertile 2 days later... Good luck with your situation-