We are ttc girl round 1 from today so went out to buy some Sudafed (live in the UK) so the decongestant is behind the pharmacy counter so when I asked for it the pharmacist said their own brand of decongestant was cheaper and just the same it has pseudoephedrine in it is that the key ingredient needed to lower cm? If not do I need to go buy something else today? I am nervous now its here