Symptoms--Could it be?!

Ok, so I have a regular 28 day cycle. DH and I BD on CD 12 and 14--14 being my peak ovulation day. I'm now on CD 21--AF is due on 6/14. Ive been nauseous for about 5 days now, have milky white CM, and my chest has been sore for about 2 days. This is only cycle 1 of us trying since I got my Paragard removed. But do you think I really could be pregnant? I tested this morning, but it was negative. I'm hoping it's just too early. Any thoughts? I'm dying over here!!