Pregnant or Not?

Alex
I am still breastfeeding my daughter who is almost 14 months old. I think I had my first postpartum period last month and it lasted for 2-3 days. I would now be on cycle day 28 if I am cycling normally. I took a HPT yesterday and it was definitely negative. I feel like crud, though. I'm really nauseous and smells are really bothering me. Could it still be too soon to get a positive on a HPT? I feel like since I am having symptoms I should be getting a positive if I am indeed pregnant. What do you ladies think? This would be our 3rd baby. Thanks! :)