Please help.

Ok so this os month 3 of ttc for me and my husband. Im 7 dpo and 7 days till af due. This past week I've been overly tired I'll be super energized when I first wake up then like 2 hours later I get so exhausted and stag that way the rest of the day. The past 3 days my nipples to about an inch above them hurts to put pressure on if i lightly push it feels like bees stinging them all over. Last month I started taking prenatals to try and help with ttc. Could I be pregnant or is it the prenatals?