I’m freaking out

So I am freaking out I might be pregnant. I’m an average 28 cycle person. My period came on the 4th of Oct. it usually last 3 days. On the 8th of Oct I had unprotected sex and ever since I’ve been freaking OUT. I’m not sure if it’s in my mind or if I could really be pregnant. I feel bloated my stomach feels weird slight woozy and if it’s a mind thing or not I’m going to the toilet frequently. I tried several ovulation kits but I’m not really getting any lh surge reading. Between yesterday and today were supposed to be my ovulation days. I’ve been getting mild cramps and backache. My next period is expected Nov 4th... I feel so anxious and paranoid like I don’t know if I am creating symptoms in my mind. What you guys think?