Me and my bf did dry humping on 1st sept. I was wearing underwear and leggings and he was wearing underwear and pyjama. He ejaculated inside his pyjama. My periods were due between 15th sept to 19th sept. On 16th sept I had mild cramps and saw 2-3 spots of yellowish discharge mixed with little to no blood on my underwear at the same time and after that till now there were no cramps or discharge. I am very much scared as I heard that this may be sign of early pregnancy but I am share that sperm never came in contact with vagina as there were 4 layers of clothes between us. Please tell me whether its sign of pregnancy or my periods are coming and what should I do?