I have had a horrible sore throat,cold and headache today, didn't even make it out of the house and I could only find some ibroprufen. I didn't realise it was SUCH a big no no in the third trimester. I'm 35 weeks but hoping one dose won't be harmful or could it?
NHS info says if you take frequent doses after 28 weeks then speak to your GP, but one dose isn't frequent. If you're worried, call the MW for a chat - no doubt you'll be told it's fine, but it's always nice to hear from a medical bod if you're worried!
You can't take decongestants which is what is in Lemsip (apart from paracetamol). All I managed to take when I had a cold at 35 weeks was breathing in vicks vaporub in hot water, and paracetamol. It wasn't that helpful tbh!