Female Advice Preferred: Help!! What are the chances that I'm pregnant?

[MetalChick]

Hi, guys. I'm 18 and sexually active with my boyfriend. We ALWAYS use condoms and we ALWAYS check for breaks/tears when we're done. (Yes, we know they're not 100% effective.)
I am currently 4 days late on my period. I'm a bit worried, but I've been late before. I'm trying to relax myself, because I know stress makes it late. My cycles are usually 26-29 days but I've had 33-35 day cycles before. My periods last for about 8 days.

We haven't had sex since Valentine's Day because we've been sick. I've been extremely sick since August with something that's like Mono, but cannot be diagnosed (I've had multiple tests). This month, I have been on Levaquin and Azithromycin. I know that medicines can throw off your cycle. I've also lost/gained back [EDITED] pounds due to being sick and my physical activity has been lessened because Levaquin can cause Tendinitis. I haven't participated in PE at school for about a month. When I was sick, I couldn't eat very much. Now that I'm feeling better, my appetite has come back. I know that all these things can affect my cycle. Also, I am not on BC. I have talked to my doctor about it, though.

I'm also a little concerned because my boyfriend and I went for two rounds a couple weeks ago and a little while after he took the first condom off and it started to get heated again, I touched him "down there"/gave him oral and later on while having sex, I started touching myself/putting fingers in, in between positions (which guys like, apparently). I know it's a long shot, but I'm a worry-wart.

My breasts usually feel tender/heavy the week before my period, but they only started doing that two days ago, when I was two days late. I've also been having light cramping and clearish discharge. I usually get discharge the day before my period that makes me think I've gotten it.

I could use some reassurance.
Thank you!

[Blackwing]

Best to take a test

[Kindred]

Chances are you aren't pregnant. It is possible, but so unlikely it's not worth thinking about, especially with the other factors that are most likely affecting your cycle. If it makes you feel better, take a test, but honestly, I wouldn't be worried.

[Coffee.]

The medication could easily do this, so I would see your doctor or at least take a test.

[nerual:)]

Periods are really weird things and anything could be disrupting it, the meds, the weight loss, hormones, sex, stress from being ill. Anything.

i wouldn't worry about being pregnant because i don't think you are. As always, better safe than sorry so take a test to make sure

[Bem]

Not a lot You're probably not pregnant and I wouldn't fret if I were you, but we're not doctors, if you're that worried, to reiterate everyone else, take a test