Bbt slowly rising

I’ve only been taking my temp for about 2 months. Last month it seems like my temp went back to the 97.40’s quicker after ovulation versus this month it’s been rising slowly today it’s at 98.24 and yesterday it was at 98.15. Why is it slowly rising and not like a spike I’ve been using the ovulation test strips to help determine. It was positive on the 9th I had sex on the 8th and 7th and About 5-6 days before the 8th.

I try not to look too much into it because I havent been charting for Long. The day before the last one I didn’t take it as soon as I should’ve I kept moving around in bed. We’ll see how it is tomorrow if it’s still rising. My period is suppose to come in 6 days.