Hi BuckFollocks, glad you have abandoned the first thread, it was not useful! When I was heavily pregnant around last christmas I found out that my partner had been using/downloading 'rape porn' and registering on dating/no strings sex websites whilst I was pregnant (my son will be 3 weeks old soon) I had a long running thread about it on here a few wks after.
I swept it under the carpet after the initial horror/fights/etc, in order to get through the pregnancy and birth and stay sane for our other two children. Felt better to 'take control' and be totally neutral to him, and prioritise what I needed to worry about at the time. (not let him ruin it further)
I am supposed to be dealing with the whole mess right now (emotionally/practically I mean, eg. deciding what to do) but everything is increasingly getting on top of me. Btw, he was a 'family man', trusted and respected by everybody including me, an 'honest upstanding man' and all that shit...And then this 
He lied to me in a massive way when i was very vulnerable carrying his child, I thought I might be able to power through it but it is increasingly on my mind again and I will be watching your thread with interest, I know exactly how shitty you feel and am here for you if needed. Sorry to hear that you seem to have found the twin brother to my partner, in terms of twattery 
How are you feeling today? Please don't worry about letting your emotions out; when i found out about my P, I went numb and sealed it away as much as poss. This is somewhat biting me on the bum right now
The stress won't unduly affect your unborn child, my son is lovely and relaxed despite going through me being distraught whilst in hospital with middle DD early in the pregnancy and also the upset of P being a total knob during pregnancy. Look after yourself foremost, building up self esteem issue plays a huge part and it is hard, almost too hard, but can be done x