Okay...I don't usually post here, but I was bored and browsing, so I'll answer. :)
First, as long as your sex isn't uncomfortable and you don't have any bleeding or spotting afterwards....go for it!! DH and I like rough sex too and continued as long as it was comfortable with both of my girls. I miscarried early on during my first pregnancy, but that wasn't due to sex since he was in another state the entire 14 weeks.
As for swallowing...it's perfectly safe. The sperm dies once it hits the stomach acid. nothing to worry about. It's not as gross as you may think, though try to swallow instantly and dont' hold it around in your mouth. That part grosses me out, but swallowing doesn't. :)
As for sex on top....he is deeper because of the angle. In fact, I can't have sex with me on top not because I'm horrible, though I am, but because it hurts!! I have a tilted uterus, it's tilted all the way backwards, and when I'm on top, it hurts....alot. When I'm pregnant it doesn't hurt too much, but then I've got this huge belly and am totally self conscious! lol
Good luck and experiment. You can google sex positions during pregnancy to find some that may be more comfortable for you.