Hi, and congratulations!
Please don't worry, Alf won't miss out on any love - you'll still have plenty of opportunity to show him how much you love him, and he'll be getting extra love from his brother or sister.
It is hard not to feel a bit guilty though, but it's entirely normal. I have Jacob who's 2 and Noah who's 20 weeks. I sometimes feel a bit guilty if I'm giving one some attention, but they do each get lots of love, and I think it's great for them to have each other.
It is a scary time being pregnant again, but for me it was easier once I'd got to know Noah when he was born - it all made much more sense then - he was his own little person who I loved, not just an unknown someone (although he was much wanted and I did love him before he was born - I guess I'm not making much sense, sorry!)
I guess you've told your hubby now - what did he say? xx