Essentially, forensic psychology involves applying psychology to the field of criminal investigation and the law. Forensic psychologists utilize their knowledge of psychological principles and use it to understand different aspects of the legal system.
You can tart testing for preganncy about 14 days after sex. You would not know you are pregnant for 2-3 weeks after sex. I had sex about a week ago and I have a really bad feeling I may be pregnant.
When you have irregular periods, that question of can I be pregnant becomes harder to answer. You should be able to test about two weeks after you had sex though, if you don't regularly have unprotected sex. If you do, and you are trying to conceive, just take pregnancy tests like once a week. Pregnancy symptoms can also show up within two weeks or so, by the way.