Got nexplanon removed 3/4/16, had unprotected sex 3/6/16, ovulated 3/8/16.... could i be pregnant?

You could become pre: Sperms stay around in the female reproductive passages for 3-4 days. So, if you were correct with the date of your ovulation time, then Pregnancy is theoretically a possibility. Yet you can not be certain till you get a positive test for pregnancy. If you want to find out, get a pregnancy test done in one month.

5 days: sperm can survive up to 5 days and fertilize an egg.