When can I take a preg. Test?

Betty
I'm now 6dpo 1st cycle ttc. The anticipation omg it's so bad. I eat sleep and dream BABY! Am I? Am I not? Lol I know most you ladies know what I mean! When can I realistically test? 
I had a positive ovulation test on dec 15
Dtd dec 14,15,16
Symptoms: sore breasts, bloating,cramps