For me, constipation has just gotten worse throughout the pregnancy Especially after starting iron tablets around 28 weeks.
I tried lunalax (not sure if you get it in the uk, but there's sure to be something similar) which is natural plant fibres which you mix with water and it swells and fills the intestines and keeps things moving.
Loads of water (juice pushed up my blood sugars too much) and fruit tea too. Hot water with lemon is something I also started with and seems to help things along.
Congratulations of your BFP! I hate to say it, but I think this constipation thingie just gets worse and worse. I've tried lots of different things and do most of these each day - I have no idea what's working, but something is helping it all along! I start the day with warm water with lemon. Porridge oat soaked overnight in milk - then whizzed up with a banana, another fruit and 1 tbsp ground linseed. A small (like a shot) glass of prune juice before every meal. Lots of lemon and water through the day. Some dried apricots. My midwife suggested soaking linseed in a little fruit juice to make a gloopy thing - I've only tried this once and couldn't stomach it. She also suggested not eating fruit or raw food after 4pm and going light on evening food to give my digestion a chance. I'm also anemic and I'm taking something called floradix as this is easier on your digestion too.
My top ones are:
1. Porridge with bran and linseed
2. dried apricots
3. fybogel - which is a drink made from a plant (ispaghula) husk - safe in pregnancy
4. chicken spinach balti
Hope its gets better, mine would still be bad I think without the above!
The one thing i found that gave me a good clear out was eating a mars bar!! I know it sounds weird but it really worked for me!
My constipation got worse through my pg and i was also put on iron tablets which made it even worse!!