Disclaimer: OK, I'm really not this daft. Normally. But:
I'm 20.5 wks. The baby's been really active and I've been able to feel her/him for weeks now. For at least a fortnight, it's been distinct kicks. Last sunday, I was entertained by a virtual can-can round my navel, while we were watching Sherlock Holmes! 
It was lovely. (SH was good too.) I was actually able to feel them from the outside, which is a first for this pregnancy.
Since then, the kicks have been less distinct and never round the navel - they're all down round my groin. They're still there, but not as enthusiastic. (There was one just now! Down at the bottom of the bump)
Ok, here's the daft bit, and please bear in mind that I'm extremely hormonal, coping on my own with DS this week, and very stressed. 
On monday morning, DH went to America for a week on work. 
An hour after that, I had a phone call to say that the house we had had an offer accepted on, had been pulled from the market, and we'd been gazzumped. I think I over-reacted (hormones, anyone?) but I basically spent about 30 mins crying hard and ranting about evil vendors. I am SO angry and sad and distraught to have lost somewhere we thought was a done deal, somewhere we were going to feel safe moving to, and safe to have our baby in.
I then reined it in for the baby's sake (more or less, but am still dissolving into tears at a moment's notice). And since then, all the kicks have been a lot less robost-feeling, or at least, they feel like that because they're all at the bottom of the bump. I know I'm mad, but I have the stupid conviction that I've - I dunno - done something. You're not meant to get this upset in pregnancy, and I can't remember the last time I was that upset - years and years. Like I said, pregnant house-movers have no sense of proportion.
Please could someone more level-headed than me, reassure me? I haven't 'done' anything, have I? (I have this image of the poor baby, cowering at the bottom of my womb because of all the scary cortisol. Stupid, I know.)