I have a friend who after 5 years of IVF finally had 2 DS, 18mths apart, when 2nd DS was about 2 she felt unwell and found out she was 10 weeks pg with DS3 her hubby had the snip and low and behold 2 1/2 years later DS4 appeared

my story isn't IVF but fertility treatement related
1st pg natural ectopic,
2nd pg natural s/b @ 21 weeks,
we tried for 13 mths nothing went on clomid 3rd cycle pg m/c at 7 weeks,
had another short break then 3rd cycle clomid pg m/c at 10 weeks,
2 cycles clomid conceived Jack, t
ried for 8mths nothing so back on clomid 9 cycles pg m/c at 7 weeks
again lots of cycles clomid in dec last year we decided enough was enough happy with our Jack 2 cycles low and behold pg seriously no idea how it happened total fluke as I had been unwell and had stuff all sex