So for context, a girl i slept with 6 months ago and i had some initial pregnancy scares, she took a test and it showed negative. 

But every now and then i get these episodes of doubt, being super stressed out , panic attacks etc. what if shes pregnant? 

There are so many things that disprive this, she said she wasnt, my friends saw her party and drink, the test was negative, i would have heard about it from people etc. i just can seem to fully trust or believe these facts tho, any help?