If you are really worried about pregnancy
and risks to your baby, it is advisable to speak to your doctor and explain. As a doctor, we have to respect patient's confidentiality.
It is important to know before surgery and anaesthesia whether there is chance of you being pregnant, as some of the medicines/anaesthetic agents can have effects on your baby.
I wish you are able to discuss with doctor/any other family person who can support you in this.