Symptoms?

Ive been getting headaches lately. Few days or so. N peeing more possibly. My period isn't due yet. But I usually get cramping before my period. We tried on the 15th n 19th. Glow said that the 19th is my highest day. But ppl say I could've ovulated on the 17th or 18th. My bbt keeps getting higher. This morning it was 98. I don't know for sure what all it's doing. My periods r usually between the 23rd n the 27th. So they're is still a chance I might get it. Is there any fertility aids I should try? And is it possible that I haven't gotten pregnant cuz their isn't much time between ovulation n my period? I read it takes 7-10 days. ​