Congratulations! That's fantastic news. You must be so excited.
Do try not to worry about the age thing. You are a spring chicken! I got pregnant last year (am now 32 wks) when I was about to turn 41. It was totally unexpected, in fact we weren't even trying and hadn't planned on having children... but now we've got our heads round it, we're over the moon.
One of my first thoughts, when I found out I was pregnant, at 9 weeks, was 'oh my God, at my age! I'll never cope. It'll never happen, something is bound to go wrong. And what will people say?!' Needless to say GP, midwife etc hardly batted an eyelid and so far (fingers crossed) everything has gone smoothly. I'm now proudly sporting a big old bump that kicks away like a footballer (a pink one, mind) and very much looking forward to starting maternity leave in just over 3 weeks. Most serious side effects for me (so far) have been a bit of back ache, the usual tiredness and puffy hands and feet.
By the way, I had plenty of the pains your'e talking about in the first trimester, cramps, a bit of spotting too, but nothing to worry about. Just do what your body tells you - have a lie down and a hot water bottle helps loads.
Enjoy your pregnancy!