Welcome to Mumsnet xCharlotte It is a great site, I have learnt so much and met so many lovely and supportive ladies since I joined in June. No BFP yet but the best thing about this site is it always restores your faith that the next cycle WILL be the lucky one!
The most valuable lessons for me have been how to chart my temperature and my CM to determine when I OV so that I can plan BDing in my fertile time. Many say that this causes stress and you are better of BDing 2-3/week throughout your cycle but I like the power the knowledge gives me and I find it fascinating. If you are interested Toni Weschler's book "Taking Charge of Your Fertility" is a great book, or we can help on the various TTC threads.
I have personally given up on the OPKs. I got a few positives the first few cycles but then all negatives which stressed me out and I think delayed OV. Each to their own though. The saliva scope hasn't worked well for me this cycle either.
Can't really say how long it should take to get pregnant, everyone is different but they do say to give it a year before seeking medical advice but some think that if you are timing BDing for your fertile time, it should be less than that. Sorry, it's such a dark art, it's so hard to say.
That's great that you both got positives on the fertility tests. How do they work and were they expensive?
I wouldn't just go for it on 2 days if I were you, I would aim for every day or every other for the 5 days before OV, the day of and the day after. This is because sperm can live for up to 5 days in fertile CM, if you have it that long that is. If not, you can buy a sperm friendly lubricant called Pre-Seed which can apparently mimic fertile CM and let sperm survive and swim.
I hope this helps, stick around and join us on some of the other threads and all the very best to you, sending you tons of Babydust!!!!!!