Pregant or not so confused help me 😭

So I get my period every 28th of the month it's been like that since i was 14 this month I didn't get it at all i have had cramps and head aches and been feeling sick but not being able to puke I do have some sticky whitish yellow discharge I had sex around like the 16th 17th and 18th of this month I know what period symptoms feel like and these just aren't it they are usually worse then this is want your guy's advice first before I go pick up the test I mean I only have 2 days to get it and then another month starts so anything helps thank you guys so much 💕