Irregular or pregnant. HELP!!!PLEASE!

Vivian
I first started tracking my period in July using this app. My. One from July 27 to August 3 the next one was from August 21 to August 26 and then my last period was from September 15 to the 21st. So my period was supposed to come last month around the 21st. However usually my period is irreuglar and late and as you noticed you have those dates I've given it is pretty irregular. On November 2 I took a pregnancy test because I was concerned whether I was pregnant or not. The test came out negative however my period is still not here and I am unsure when I should test again. I should also note that for the past three weeks I've had a bladder infection (taking antibiotics everyday)and previously I've had UTIs as well and now I noticed yesterday that I have  yeast infection. I should also note that I have not been sleeping very well in terms of times I go to bed I've been getting about six hours of sleep each day and going to bed way too late which is probably why my body is tired and I'm getting these infections. In September I also had a scare because I thought I left my tampon inside it was a point where I went to the doctor and she checked inside into two of not found anything but I was almost 100% sure that I did put one in but I'm sure by now if there was something in there I would know. Anyway I am not sure if I'm pregnant or not even though I took the test I probably should take another one in the future but if by the end of next week with this month should I go see a doctor? I have also been having a lot of stress lately which I know can also add to delaying your. However it is only because I'm sexually active and now I have these infection and I'm unsure if these early signs of pregnancy.