Week 20 tiredness is back is this normal?

[Ladypug]

I was really tired at beginning of pregnancy then great from week 14 but now suddenly really tired again - is this normal?

Yes IMO. I find with pregnancy that it doesn't always happen in a linear fashion that one thing follows another, but you get growth spurts/developmental leaps (just as you do after baby is born!) and accordingly you will have hormonal spikes so you have weeks where it hits you hard and then evens out. I feel tired/nauseous/emotional and get spots on my chin, this happens for me the whole way through, though to a lesser extent in second tri. I know that lasts about 4 days or so each time and then it will ease off or level out again. I'm 39 weeks and feel great, I was 38 weeks and shattered last week. There's no set rules to it.