I wouldn't worry about it until you miss your cycle. but anytime you have unprotected sex there is a chance of pregnancy whether or not he ejaculated or not. because of pre ejaculation. so don't worry until you miss your cycle if you miss it. good luck hun.
You may think that, him pulling out, before he ejaculates is fine, and your not going get pregnant,, but take pre-*** for example,,, men don't no when they've done it,,, pre-*** is a ***** and plenty of people get caught this way,,, if your not wanting a baby, then use something :D :D xxxx