There are several possibilities:

sometimes it takes up to a year or so for the effects of the pill to work out of your system;

sometimes (very rare!!) the pill can actually cause infertility.

Most couples make love rather than try to fall pregnant (in other words they enjoy themselves, they're relaxed & so when it happens it happens, they don't concentrate on getting pregnant & then when it doesn't happen immediately get uptight, not relaxed & of course it becomes less likely to happen at all & believe me 6 months is no time, often it takes people several years).

Have you both been tested to ensure that you can (both!!) conceive?

As to your period being "out of order" this too is a side effect of taking the pill & one experienced by many women. Nevertheless I would suggest that you see an ob/gyn & have a check-up to rule out any other medical condition; have your oestrogen levels checked & at the same time (if not done previously) have yourself & your husband checked to ensure that you are both fertile, that he doesn't have a low sperm count & you might also discuss checking when you ovulate. I have a floating ovulation(i can ovulate at any time in the month, some women can ovulate moer than once a month & others do not ovulate at the most common time (about midcycle).