Firstly, congratulations!
I have an 18 year old daughter, 10 month old son, had a miscarriage in August when he was 4 months (completely unplanned, I was on contraception) and am currently 20 weeks. I can honestly say all 4 pregnancies were different.
First one, absolute dream (I was 20 so maybe youth helped haha), no problems at all, no sickness, nothing. Sailed through it.... until I had a placental abruption at 37 weeks and had an emergency section, lol.
Second one, hyperemisis kicked my arse and i was puking circles round myself feom about 4 weeks when we found out. Lost 9 stone in total through the pregnancy (though I did have a fair bit to loose so win win I guess).
The miscarriage in August I had horrific heartburn and indigestion.
This pregnancy (20 weeks now) massive boobs since about 5 weeks, bit of nausea but nothing compared to when I was pregnant with my son, bit more tired than I was last time but the 10 month old is very, very active so that contributes to being tired.
Mine have all been massively different. There's no textbook symptoms you should and shouldn't have so please, I know it's hard but try not to worry. Congratulations again!