Hi these Somesh,
Sorry to hear that you are experiencing a lot of anxiety around this at the moment. I am glad to hear you were able to have an open conversation about this with your girlfriend, so that you both are on the same page with regards to sex and risk.
With anxieties, sometimes even when we have the information, this doesn't mean that the feelings or worries will go away straight away, or on their own. The thoughts where we keep imagining things that "could" happen even if they aren't possible, can be called "catastrophising", sometimes when go through a really stressful experience (like a pregnancy scare), our brain can go into overdrive trying to stop it happening again, and starts to imagine situations to avoid, however when these are not based in fact and won't leave us, then they are unhelpful.
Giving yourself time to further recover from the stressful experience and reassure yourself that you and your partner together have the correct information about how pregnancy works and how to be safe together (which you do) can help, as can talking to a therapist about dealing with anxiety and these intrusive thoughts, as they can give you some techniques/tools to help you address them when they arise. For quick reference, Urna provided a list of providers in your region, in this post
Here are also some online worksheets and tools that you may find useful:
- e-couch Anxiety & Worry program An online, self-directed training program which provides interactive self-help and evidence-based information, which was developed and evaluated over 10 years by researchers at the Australian National University.
- Anxiety self-help guide A self-help guide for anxiety that uses cognitive behavioural therapy (CBT), provided by the NHS (the National Health Service in the UK)