[Latte]

First of all, get a pregnancy test just to be sure; since it sounds like you have irregular periods at the best of times, you might not be able to use your period as a reliable indicator, so just do a test to rule it out.

Secondly, I would recommend that you go and see a doctor, even if you're not pregnant. I think it's something like 35 days (or 5 weeks) is kind of the upper limit of how long a cycle should last, and while it might not be a big deal at all, it might just be useful to rule out possible gynocological issues that cause you to have long periods (e.g. PCOS and such) because a lot of those issues can be managed. I have a few friends who have PCOS and endometriosis and birth control has been very effective at managing the symptoms, so it's worth checking out and seeing what's up. If nothing is wrong, it'll also help put your mind to rest.