Girlfriend (F)17 and me M(17) 2nd period after intimacy got delayed

GF F(17) Weigh-45kgs height-5'2 and (M)17 had intercourse at 29 APRIL with all necessary protection and condoms. Her expected period was at 11 MAY but it got delayed and by eating ginger and exercising remedies , she got her PERIODS in 22 MAY which lasted 8 days.Now this month she should have her periods by 22 JUNE but she isn't getting it even after exercising and eating gingers and all and it's very stressful as she and I are scared as she believes that it has never been like that she tried all remedies and her periods didn't come. Is she possibly pregnant? Please help as we are teens and very stressed out.*NOTE- Didn't have intimacy(WITH PROTECTION )after 29 APRIL and mostly after every intimacy period cycle gets delayed but comes with the remedies unlike this time..PLEASE HELP