Luckybird - welcome!! Since you have irregular periods, I'd try charting my basal temps and checking cervical mucus (if you aren't already doing that). I think you should definitely go back to the doctor in April when you've been trying for 1 year - INSIST that they either investigate further or refer you to a fertility centre. But hopefully you will get your BFP before then 
Update on my fertility appt: I just got back. It went well and the doctor is recommending we go straight to IVF due to my endometriosis and tube issues. Wasn't expecting that quite so soon, but I'll take it! Just have to fill out some consent forms and wait for the NHS funding and next steps (probably more tests!)
Scarlett - so the entire thing took around 1.5 hours. The actual face time with the doctor didn't take very long (we just briefly went through my endometriosis history, previous blood tests, and hubby's sperm analysis), but I had to fill out some forms and got my weight, height and blood pressure taken, then had to give urine and wait to get blood taken. So in total about 1.5 hours!

Update on my fertility appt: I just got back. It went well and the doctor is recommending we go straight to IVF due to my endometriosis and tube issues. Wasn't expecting that quite so soon, but I'll take it! Just have to fill out some consent forms and wait for the NHS funding and next steps (probably more tests!)
Scarlett - so the entire thing took around 1.5 hours. The actual face time with the doctor didn't take very long (we just briefly went through my endometriosis history, previous blood tests, and hubby's sperm analysis), but I had to fill out some forms and got my weight, height and blood pressure taken, then had to give urine and wait to get blood taken. So in total about 1.5 hours!