Whats wrong with me!?

Before I got with my boyfriend I was 120 because my previous relationship I was always being abused and stressed and anxious so I couldn't gain any weight, now that I'm finally happy and stress free I am 138.. We Are trying for a baby now and I the past few days I just want to sleep, no appetite and I normally eat all the time. No energy sore boobs and my last cycle was five days early and super light. Now that I'm almost due for this cycle I took a test last week out of curiosity and it was negative. I am a two pack a day smoker and the last few days it's it's been less than a pack and I have not smoked at all today. What's the matter with me..