Should i take a pregnancy test?

Well, its been a week I haven't got my period and my boyfriend has ejaculated in me on my ovulation day and I'm thinking I might be but at the same time I'm feeling some cramping and my breast get tender time to time. So what do you think, and what should I do? And I don't mean if I am I'm getting rid of it because that's a big no no. :/ thanks :)