Could i be pregnant 😬

friday 12th we had sex aswell as Saturday and sunday but he didnt pull out and i had finished my period two days before (wednesday) we had sex and for the past couple of days ive been spotting on and off pinkish blood and ive been getting really stressed like so easily and when should i take a test  Of i forgot to mention i have regular periods and im normaly on for four/5 days