Two positives and one negative?

I'm so confused. I took an equate pregnancy test on sunday and it came back positive almost instantly. I was in doubt so I bought two answers tests but I messed them up because I didn't pee on them that well, so I just ignored them and went to planned parenthood today and they tested me negative. They said their tests were 98% accurate while the one I took was 99% accurate. They said it could be because of ovulation that I got a false positive, I bought another test thinking that if that came back negative if I wasn't pregnant this one would too and I wanted to be sure. I took another equate (low on money) and it came up positive almost as fast as the other one did. I did so much research on the internet and they said that usually doctor tests check for higher levels of hormones, while the low brand tests test lower amounts of hcg. I have symptoms of being pregnant. I had light bleeding, slight cramps, strange cravings, heightened sense of smell, frequent urination, and tiredness. I read that ovulation only lasts 24-36 hours so I waited till wednesday to take another test and I'm just so confused I don't know what to do. I looked up the sensitivity of various tests and the equate measures 25 while other brands list 50 to 100 so I'm not sure what to think. Do you think I could be pregnant? I'm not on any hormones by the way.