I finished my periods on 19th November and had sex on 24th nov evening, although m still not sure whether the ejection just flowed outside or whether it really happen while my partner was inside, since it was the first time that we had sex. Will I get pregnant? Not taken any pills or any other precaution yet.

There is no way for us to know if you will get pregnant from this encounter. If you are not ready to be a parent, you should be taking precautions every time you have sex.

The issue is, yes of course you can get pregnant, heas does not have to "finish" in you, he just be in you, plenty of sperm in the early fluids to do the job.

No way to tell this early, You have to wait till time for next period and see if you miss it