Concerned about two periods in one month then none the following month

[Samantha25]

Hello I am Samantha I have a concern. In June I had my period twice first one lasted for five In which it return three days after lasting another five days. During which I had spotting between both periods I was I was pregnant and worse July period seems late so I did a pregnancy test which was negative. Now July is almost over still no period and I have days I feel extremely tired shortness of breath during the nights I pee a lot some times. Last night I had sex too I felt some what of a discomfort or pain rather. Am really worried about what's going on inside my body. Then few days ago I woke up with this blood spot on my leg and I have no memory of hurting myself.