Hello... I know how you feel, trust me I have been there!
I came off the pill last December after 10 years of taking it.
My first couple of cycles after coming off the pill were pretty normal... 30 and 29 days if I remember rightly.
Then my cycles got a bit weird... Started having 35 day cycles and had one cycle that was 48 days and another that was just over 40 days as well 
And all this time we were ttc which is really hard when you don't know what's going on with your cycles/when you're ovulating etc.
DH and I don't have particularly high sex drives either so we tried to have as much sex as possible but tried to do it mostly around when I thought I was ovulating.... Which , as I said, was tricky with unpredictable cycles!
Also DH works long hours, sometimes away from home, and I do shift work... So it was hard!!!!
I tried temping and charting for a couple of cycles but it didn't work for me due to my shift work so I gave that up.
In the mean time, my sister and my cousin both announced that they were expecting... As well as people I work with, people on Facebook.... When you're ttc you notice everyone around you is pregnant!!!!!
Anyway, what worked for me was clearblue digital opks.... And the fact that my cycle, coincidentally at the same as starting to use the OPKs, started to regulate.
First month of using OPKs I got a positive on cd20.
Second month I got a positive on cd20.
Third month I got a positive on cd25
Fourth month I got a positive on cd20..... And I got a bfp 2 weeks later and I'm now 8 weeks pregnant! 
It was useful for me to use OPKs because I started to see I was ovulating about a week later than the "average" woman does.
Over the months I would also notice an increase in EWCM starting around cd16-17 and peaking around the day of my positive OPK.
We would generally start dtd (for ttc purposes) around cd16-17 when I would start to notice small amounts of EWCM and then we would try and do SMEP.
With SMEP, you dtd every other day up until you get a positive OPK. Once you get a positive OPK, you dtd on that day and for the next 2 days (so 3 days in a row) , skip a day and then dtd one more time..... Or more if you want to! 
Funnily enough, the month I conceived was the month we dtd the least!
We dtd on cd18... Skipped cd19 as per SMEP... Then I got my positive on cd20 and we dtd that night.
DH went away very early the next day for a work conference and wasn't back til late a day or so later... And I was on shift. So basically around the time of ovulation we dtd twice! But it worked 
Lots of people will tell you to just relax and have lots of sex but it's not always that easy depending on your sex drives, working hours, cycles etc etc.
Personally I would suggest tracking your cycles (if you aren't already) and using digital OPKs. When you get a positive OPK, have lots of sex! And try to have regular sex leading up to a positive OPK. That way you've covered it!
It may not happen straight away... It took me 4 cycles of having sex at the right time for me to conceive... But it will happen for you eventually 
We also used conceive plus lubricant... Don't know if it helped but we use lube sometimes anyway and it's better to use one that's sperm friendly and can actually help the swimmers get to their destination! 
Also I started taking pregnacare conception tablets as soon we started ttc.
I also tried to eat more healthily and drunk much more water when ttc... Again I'm not sure if that helps but I felt like I needed to be a bit healthier!
Hope this helps... Sorry it's so long!!! 