Did you get your period? How is it going?
Honey, whether he "ejaculated but didn't let it all in" or not, there are millions of sperm in one ejaculation, it hardly matters if he "let it all in" or not, you were definitely at risk from even a teeny weeny bit. It's good that you took the morning-after pill, since sperm can also live a few days in your body, and there is the chance that you might ovulate early if your cycles are not like clockwork (same length between periods every month). I assume the morning-after pill worked for you, and that is a good thing, but it would really be so much smarter for you to never have unprotected sex. I don't care how persuasive your boyfriend might be for having sex without protection, you are the one who would be caught holding the bag. Please at the very least, use condoms, and also get on a birth-control method that is not as hard on your body as the morning-after pill. It is not meant for regular use. An IUD or the pill or the implant will all protect you and be less harsh on your system.
Remember that emergency contraceptive will mess up your cycle. Girls are often late or irregular for up to 3 months after taking the after sex pill. So, try not to panic. It's normal.
Cycle day 6 is not high risk. The EC pill would have further minimized the chances. You have very little to worry about. You could run a home pregnancy test when your next period is expected.
Please buy your own conforms and insist on their proper use. Download a period tracker app to get a better handle on the higher risk days, usually CD 8 they 16 of 28. Best of luck!