Oh poor you shirley HG sounds absolutely awful and hope it improves for you.
DS is only 17 months so not really old enough to grasp anything about a sibling just yet. He does have a doll which we call "the baby" though that he likes to throw around 
Had my scan and saw a heartbeat, EDD put forward 2 days so amending on the list and will add jingles in and momma and madamepeacock putting you in the right place for dates OCD moment.
Northernexile #3 EDD 28.04.2017
Niks2026 #3 EDD 01.05.2017
Hanflan #2 EDD 02.05.2017
EnterWittyUsernameHere #1 EDD 03.05.2017
Ginandcake #3 EDD 04.05.2017
CinnamonTwist 26 #1 EDD 05.05.2017
Sipperskipper #1 EDD 05.05.2017
Peasy1 #2 EDD 06.05.2017
Rabbitykins55 #1 EDD 06.05.2017
Lalaland #1 EDD 06.05.2017
Ghost #3 EDD 06.05.2017
SK28 #2 EDD 06.05.2017
mommathatwearspink #2 EDD 06.5.2017
teainbed #4 EDD 07.05.2017
iCoCo #1 EDD 07.05.2017
Brightsmoke #1 EDD 08.05.2017
Jingles80 #1 EDD 08.05.2017
stationaryace #2 EDD 11.05.2017
Run247 #1 EDD 11.05.2017
BeanSpr0ut #2 EDD 12.05.2017
Sonnet18 #2 EDD 13.05.2017
4sacharm #4 EDD 13.05.2017
Aaaaaargh #3 EDD 15.05.2017
MadamePeacock #1 EDD 15.05.2017
Gurtie28 #1 EDD 16.05.2017
talulahbelle #2 EDD 17.05.2017
Fempsych #2 EDD 18.05.2017
IAmSeriousAndDontCallMeShirley 30 #2 EDD 19.05.2017
Crazyzoo #1 EDD 19.05.2017
AnneLovesGilbert #1 EDD 20.05.2017
ImogenTubbs #2 EDD 20.05.2017
Jennymac31 #2 EDD 20.05.2017
PeachIcedT #1 EDD 21.05.2017
Sunflower30 #3 EDD 21.05.2017
JulyLady7 #1 EDD 21.05.2017
Streaky17 #1 EDD 22.05.2017
Sauvignonismysaviour #1 EDD 23.05.2017
Peasandquiet #2 EDD 24.05.2017
MrsCW86 #1 EDD 25.05.2017
Mamushka #2 EDD 25.05.2017
Sunshinie #1 EDD 26.05.2017
Mrspage1985 #1 EDD 27.05.2017
Lullaby23 #2 EDD 28.05.2017
ImYourWomanJonSnow #2 EDD 29.05.2017
Mustangsallyis #2 EDD 29.05.2017
ICuntSeeYourPoint #3 EDD ??30.05.2017
LorrieJ #2 EDD 06.06.2016 but will be CS late May?