Confused

Any help pls? I had sex with my hubby on almost all my fertile days including ovulation day. Af was supposed to come on 08/10 like glow predicted. I'm a regular but it came late and arrived on 09/10 but for only two days which is brown and later turned to pink and usually my menses is five days. Now am experiencing severe backaches and severe cramps and am also salivating. I did an hpt but came out negative today in de morning. Pls can anyone help out cause am so confused. Tanks