It's possible if I don't bring it up that my husband would forget - but he's always made a big deal out of his birthday "month" being special, so I figure I get the same amount of time, only I forget until it's a week into the month

both of us are born later (21/20 of the month). So we talk about it enough he hasn't forgotten (yet).
he did however not get me a present this year. But - he asked what I wanted, and I only wanted to put money towards a new camera or somethings we really needed (new TV, couch). So I basically said I wanted nothing, that's what I got... I did however get an amazing weekend of doing whatever I wanted to do, which included dinner out one night with friends, and a luxurious and pricey brunch! He worried that he screwed up by not getting a card, I said no, I don't care about cards that much. At the time I was hoping he still had a gift for me... He didn't. I'm (now) ok with it as really anything I wanted I had. Next year, if I don't have a wish list for him to shop from, I'll ask him to just get me something he finds so I have something to open.
And the follow up is that I got enough birthday money from family to buy the camera I wanted, only it went up in price (it was a refurbished one from the manufacturer.) I would have waited and saved more for the new one, but I ended up buying it with his blessing and consider it my birthday gift from him (and the rest of the family).
Now, my dad on the other hand, has forgotten my birthday for 3 years in a row.

At first I thought it was payback, as I forgot his birthday (remembering a week or two later) two years in a row. I plead innocent on the first, as my mom decided (rightfully so) that I was an adult and didn't need her to remind me of her ex-husband's birthday. Only she never told me this decision, and I always relied on her reminders

lesson learned! I did apologize profusely and send gifts late. Second time, I forgot to have the entry on the online calendar carry over year to year.
And three years go by, with phone calls on thanksgiving (since he moved out of state) which is right AFTER my birthday, and nothing. Every year since my grandma died and hasn't been there to remind him. I don't even know how to say anything about it now, but I have stopped stressing and buying gifts on his birthday (I do call him though!!!)