I had my last one at 24 weeks - it was supposed to be the last one at 20 weeks however the ultrasound lady couldn't get a clear shot of the heart or the profile, so i had to back again. Becoz that stressed us out a fair bit, we got the 4D for free which was amazing. But I won't have any more scans from now on...just gotta wait for little bub to make his/her entrance and then I can check him/her out for real

good luck!!