as far as i know you can have sex all the way through pregnancy! your cervix should be sealed to prevent infections etc getting to the baby and as long as you go gentle in the later months you'll be fine!
the problems that occur are things like positions (some get uncomfortable or impossible with a big bump) and needing the loo lots!
Information on this site is provided for informational purposes only.
It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.