should I be worried

So I had a baby 14 weeks ago, I am breastfeeding but I got my first period a little over two month after his birth.. nov. 5.. which means I'm due any day now with aunt flow ... but these past three days now I have been sick to my stomach and very moody like I can rip someone's head off haha.. my husband and I have been having unprotected sex since 5 weeks after our son was born.. could I be pregnant again?