Not pregnant but..

I haven't had sex since mid september. I took a urine test Nov 25th and it was negative. Still i have some concerns:

1. My periode has alway been 7-8days, last two cycles it was only 4days

2. Last 3-4 weeks I have had a bump on my stomach when i wake up in the morning, it is gone after toilet

3. This week I have had some sharp pain in both sides. Nothing seriuos, like when I ran like crazy as kid

4. My visits to the toilet has increased a lot.

Is my mind playing tricks on me? Anyone one else had negetive urine teat at app. Week 15 and still had a healthy pregnancy?

Any thoughts are appreciated, I am going crazy..