Pregnancy

Alright so me and my boyfriend use protection every time we have sex (condoms) well I had my period twice last month (due to taking the morning after pill twice because I get paranoid.) and so this app said I was supposed to start my period today but I didn't. I took a test the other day and it said negative (I checked in the time frame 2-10 minutes) well then I kept it and checked it about two hours later and it looked positive could this be a evaporation line? Also this this was a cheap 5 dollar test so I went to the store and bought better ones and took two at night and one in the morning and they all came out negative. Do you think there's a chance I could be pregnant? I'm really stressing out.