The clots in your period are from the lining of the uterous, if the uterous shed its lining, you are not pregnant.
If it lasted 4 days, probably not pregnant.
BUT like JudyKayTee said, take a home pregnancy test. Also unprotected sex can be dangerous if you or your haven't been tested for STDs, and of course you CAN get pregnant even if he doesn't ejaculate inside you.
Maybe go on the contraceptive pill, this will regulate your periods as well as prevent pregnancy. You still need to use condoms unless you have both been tested for STDs though.
Hope this helps xx
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