10 years ago I could have written your post pretty much word for word. Only there was no insta and YouTube wasn't as big.
I spent my 3rd trimester, not on mumsnet finding out how to look after a baby (I had no clue) but on style and beauty because I felt and looked like shite.
To save money I'd worn my sisters maternity wardrobe, she dresses completely differently to me, so nothing I wore suited or felt nice. We also stayed in for 9 months to save money so what was the point of dressing up.
Then I fell for the ohhh you need to dress xyz because you won't have time when the baby is born.
So mine were
No contact lenses only glasses
Grow your hair long, time for mum bun
Jeggings
Bretons
Cardigans
A nice scarf for BF
A hideous pair of clarkes boots would work with both Jersey dresses (hide the mum tum with the scarf of course and the jeggings)
This was all info I gathered in the middle of the night from S&B.
Now my personal style has always been somewhat eclectic, but NO I was a MOTHER now I must put my personal tastes behind me and my jeggings in front.
It's not as bad here now of course. But I did all these things, and bought all those outfits that to me (in my own personal private opinion) were frumpy nightmare looks and I wore them.
Then one day about 6 months in I saw myself in Debenhams and went who the fuck are you, left the baby in his pram with my dad and marched to the nearest hairdresser and got my hair cut off. So fucking freeing. Boots went in the bin and eventually once they fitted again I went back to my old wardrobe.
And I had time everyday(OK most, sometimes I couldn't be arsed or the baby was having a day too) to do my hair and makeup, and shower.
So I suppose I want to say this time will pass, you will still be you when you have your precious baby.
Also I regret staying in for 9 months, you'll find the money when the baby comes, you will never have the child free time back (I'm assuming this is your 1st)
GO ON THE DATES! Dress up now, do free or cheap things,date at home.
You are you FIRST and a Mother second, the whole oxygen analogy and all that.
For a nice treat now I recommend Dior nail glow it makes your own nails just look better and kind of fades off so you don't have a chipping issue, it's expensive for nail polish but cheaper than a salon visit.
Sorry for the lengthy post, I got a bit carried away, but I really hated those bloody tunics and jeggings