Hi widget.
Been ttc for two years and remaining positive is the hardest bit. Reading forums like these in that time it seems people go through phases.
Initially most head in to ttc in the innocent belief that they'll just dtd and get knocked up.
Then the disheartening stage kicks in if this doesn't happen as soon as they expected so they start reading up on the science (and myths)
Next comes obsession, taking temps, peeing on sticks, watching out for every sign and twinge.
Then finally at some point it changes, with all the knowledge and experience they start to feel a bit more in control.
Now hopefully you won't have to go through this.
Six months is considered a very normal length of time to ttc and Dr won't start looking in to potential problems until you've been ttc for at least a year. So four month is really not a long time.
First thing to do is to set one year of ttc as your goal. This will instantly make you feel like you've only just started. And in one years time, if you aren't pg already, you'll be prepared for the trip to the Dr.
Second thing to do is learn your cycle. Quite a few people start off assuming they are ov earlier or later than reality. I don't advocate the long term use of opk but it did help me establish what the signs of ov were and calculate my luteal phase (the time between ov and AF). Although my cycles are stupidly random I now know when to focus our efforts and how long I have to wait before getting my hopes up.
Some women either don't start dtd early enough or give up too soon (within a cycle) so the simplest method is to dtd every other day from when AF stop until she arrives again.
After a while this can get tiresome so having some clue as to when to slip on that lacy number really helps.
Lastly, take a look at your diet and lifestyle. Acting like a prego increases your chances of becoming a prego. Reduce your alcohol and caffine intake, avoid pâté, mould ripened cheeses (like Brie), eat plenty of fruit and veg and protein. Cut out smoking and do regular gentle exercise (I've found going for long walks is good because it keeps me fit and clears my head). This all helps your chances of getting that BFP but also helps you feel more incontrol and gives you something positive to focus on.
Oh and a couple of other titbits:
Saliva can kill sperm, so.. well.. avoid them meeting
Plus when you do get your BFP, avoid telling everyone and his brother. If something goes wrong it makes it all a lot harder.
Hope that all helps.
C.