Possible Pregnancy

Me & my boyfriend had sex June 18th & June 25th. My last period was June 15th-17th and I ovulated June 23rd-June 30th. I was supposed to get my period July 14th I’m a week late ... I’ve been having stomach cramps backaches & a thick white discharge I’ve also been very gassy. I’m scared to test cause I don’t want to get a negative, I wanted to wait to see if my period would come. Could I possibly be pregnant ???