Ok, I have been on Depo for 2.5 years (I do understand that it is not recommended past 2 years but my doctors and I have discussed it thoroughly). I have always had to get my shot early (at about 10 weeks rather than 12) because I always start "spotting" (although for me it has always been really heavy and more like a real period complete with bad cramps) at about 10 weeks and if I don't get the shot then the heavy bleeding continues until I get the shot. The last time I got my shot was Nov. 5 which means I am due for another one on Jan. 28 if I am following the 12 week cycle. This means that according to what my body usually does, I should have started bleeding a week ago. I didn't. I am kind of concerned about what the chances are that for some reason, this time Depo didn't work. I had unprotected sex the last two weekends in a row.
I should also mention that I have been sick since the end of November, first with a cold that turned into a sinus infection, which gave me a lung infection. I have been on two rounds of anti-biotics, as well as a steroid inhaler and nasal spray (the inhaler gave me thrush too so now I'm using an antifungal mouthwash).
I believe (correct me if I'm wrong) that anti-biotics only affect estrogen based birth control and seeing as Depo is a progestin based one it shouldn't have any affect.
Also I just quit my job (my last day was the 13th) because it was causing an EXTREME amount of stress in my life. I felt like I was on the edge of a nervous breakdown ever since the end of Nov. because of it.
So I guess my question is...Being as sick as I have been, and being as stressed out as I have been, and being on Depo for as long as I have with no problems before, am I just being paranoid about being pregnant??