Helpp!!

My gf is 7 days late. She has symptoms since past 5 days from mild to sharp pain below bellybutton with joint aches. She says that it's very similar to her previous period symptoms. We had intercouse where only tip was in for 10 seconds with no thurst and didn't ejaculate. She has white milky non sticky ordourless discharge since yesterday. Had mild cramps today but still no period. We're both 18.