I had the same problem last month. My period came on the 4th of june lasted it's regular 5 days and later came back on the 21st of june, I had sex a month earlier sometime around May 20-26, but my bf did not cum in me. Around that time I started to wake up every minute during the night to pee and I started losing weight due to stress and lack of eating also due to stress that I could be pregnant. I took the Home Pregnancy Test "4 Times" and every time it said I was not pregnant but I was still stressing. I started to read online blogs to see what other ppl who shared the same situation with me was saying and every where I went it all lead me to believe I was pregnant, Until a friend of mines told me how low the chances of me being pregnant was.
reason #1.- Pre-Cum alone can not get you pregnant 90% of the time
2. My period came on regular after I had sex!
3. I was stressing and stress and malnutrition cause spotting
4. pregnancy test says Negative.
5. Plus me and my mom both had our period 2 times that month.
I ended up getting my period on july 24. I was late because of the stressing!!!!
So ladies please dont stress your self out please!!
& If your not ready for a baby use protection at all times or JUST DON'T HAVE SEX AT ALL!