I wanted to ask about the posibiliy of being pregnant. Well, I had some kind of a sexual activity last week, on Tuesday, but I didn't really had sex. I was like 1-2 days after my ovulation, if my calendar is right. I have very irregular periods,last month came in the ovulation time and it was really light. I am talking about dry humping. To be more specific, by dry humping I mean he only touched me once near de vagina through the panties, then I went to the bathroom, washed and changed them. And when we were fully naked he only touched other parts, but not exactly the vulva, cause I didn't want to risk too much. He didn't before and I don't think he had much of the pre-ejaculation fluid.
My period is supposed to start 3-4 days from now, but I had some bloody, brownish, discharge, sometimes a bit heavier, like red blood , sometimes lighter. I have headached, back pain, sore breast but not constantly and I am also really stressed. I am worried and I don't really know what should I think

Seriously, you need to get to grips with SexEd 101 as you clearly are clueless about the mechanics of the procreation process.

I am worried just because my symptoms are weird and they match some of the symptoms you can read about even on the internet.

That's where you are making mistakes... #1 believing what you read about "symptoms" which 99% of the time the ones you see on the internet are wrong. #2. Without actual medical tests or keeping a daily Basal Temp chart for at least several months... you have no idea when you do ovulate. #3 Based on what you have said... I agree with CurlyBen. You really need to abstain from adult games until you fully understand how procreation works so you are able to take effective measures to prevent it. If you don't you will find yourself being a single mom very soon.

This is a very serious thing that has life long implications. Talk with a doctor, and not your friends who likely don't know any more than you do at this point.

What you describe is common premenstrual symptoms. The fluctuating hormones will account for most, if not all, of what you're feeling. Why this seems odd is because you're looking for anything that seems different in your cycle. You're REALLY aware of your body where as you weren't really before you had this encounter. Which is to say that before you wouldn't have given a second though to sore breasts and backpain. You're interpreting your normal cycle symptoms as pregnancy symptoms.

The only symptom you can rely on is a missed period. Since you've not had a period as of yet you'll just need to wait. Which is going to be more difficult because you've got irregular periods. Another thing to note is that your ovulation time isn't regular or predictable. Most will fall within a certain period of your cycle, but you can never know when unless you're medically tracking it. Some people have been known ot have their ovulation just before or just after their period. Depending on the type of irregular periods you're getting, you could NOT be ovulating at all. Without medical investigation, it is impossible to know.

Considering there was minimal to NO fluid transfer between his penis and your vagina, I would believe that the probability of you being pregnant is minimal to non-existent. To verify this I would wait for your period, if it does come, wait for two week after it was supposed to start and take a home pregnancy test. I would then follow up with your Doctor afterwards.

It only takes one accident to become pregnant, and pregnancy is a life altering event. Please be careful. Please take some time to understand the mechanisms behind sex and pregnancy. Make sure that when you do have sex, you're prepared for the possibility of pregnancy. No form of birthcontrol is 100% effective. There are people on this site who have gotten pregnant using three forms of birth control correctly.

Good luck.