What is going on? Is there a chance I'm pregnant?

My husband and I have been ttc for a few months. My last AF was on September 10th, but I have irregular cycles averaging about 35 days. (My normal before going on the pill was 32 days, and my body is probably still adjusting to coming off the pill. The Sept. 10th cycle was my third since coming off the pill)

So I spotted on October 10th and 11th, which was about when I expected it, though a little later, but I think that I just skipped that period due to dealing with the stress of my mom having surgery the next week. Now the surgery is over and things are normal. I've spotted again on October 30th and 31st (5 drops tops). My husband and I BD on the 18th, 26th and 29th. Still no period. The tests have been negative.

What is different with this spotting than the first spotting (aside from there being an absence of stress), is that coinciding with the most recent spotting I had a serious bout of chills and body aches hit from out of nowhere (even though the glands in my neck were not swollen as they get with colds), combined with extreme sensitivity to the smell of spicy food to the point that I literally almost hurled when my co-worker walked by with her lunch. I also was so exhausted that I couldn't even concentrate on simple data entry and thought it might not be safe to drive home that day. I did, and went straight to bed at about 6:30 pm! I couldn't eat without feeling sick to my stomach, though I did manage some oj and saltine crackers (thanks ladies, to those who recommended the saltines!). The thing is, though, that the aches and chills ended the next day. I've been tired, though not as bad as that day. My abdomen has been sore since then, but nothing has happened since the five drops of spotting.

So what do you think? I hadn't been keeping track of anything more than when the AF starts and when we BD (which I do since my cycles are irregular) Honestly, after helping with my mom's surgery, I hadn't really put any thought into ttc and was just waiting for AF to start again. We figured since my cycles are irregular, might as well have fun while waiting for it!