One day past 2ww and still no AF! But feel it knockin at the \"door\"...

I should have gotten AF by Wednesday early morning, but nothing.  Have the food cravings, the chest soreness and bloating too.  About 4pm I thought it had started so I contacted my RE.  To my suprise by the end of the evening all that had happened was just spotting.  Let me rephrase that, a spot.  There was one more spot today too, with some kind of cramping, but not the same as when AF starts.  I have always had cramps that double me over for about half a day.  My blood pressure did drop for the day like it usually does to about 95/50.  But now it's back up and I'm energized again.  I would like to believe there is a chance I could be pregnant, but I strongly doubt it!  I am wondering if the HCG shot has thrown me off.  I've been having stomache pains too.  But they are high up and feel like gas pains, but aren't gas.  Tomorrow is day 16 so I am going to do an HPT just to make sure so my RE can make sense of this.  The only other times I spotted were last spring when my chiropractor adjusted me at about day 17 of my cycle, and then when I was doing yoga postures to open the fallopian tubes.  My body has become so foreign to me these past few months.  And to top things off, my brother in-laws wife to be is stressing about her suprise New Year's wedding and like a dope, I volunteered to help her.  She's a sweet girl, but as anxiety issues that I can not deal with right now.  It's kind of selfish, but, that's the way it has to be right now to get through this.  I don't like being yelled at for petty things, and I won't be pulled into others' drama.   Is there a book out there about how to love your inlaws, and not get involved?  LOL! I absolutely adore my Mother and Father in-law!!  For that gift I am greatful!!