Would it be too early to tell?

So my boyfriend and I had intercourse 3 times during my fertile period. I am currently 6dpo I had a doctors appointment and you know they make you pee in the cup and I asked her about the test and she said it was a negative. Was it to soon to tell? By the way my last AF visit was sept 10 and I was fertile 19-23 we had intercourse the 19th, 22nd, and the 23rd. My breast or sore I am more tired. Also today I had this period like cramp in my lower abdomen. HELP!