3 months

If I dont get my period by the end of this month it’ll mark 3 months without one. I’ve taken several pregnancy tests all negatively (thank God) bc I’m not trying to conceive yet. I’ve recently been waking up with bad anxiety and throbbing headaches, and as the day goes on my stomach starts hurting like I have to poop every hour but nothing comes out and i get really nauseous. I’m going to take another test at the end of the month and make an appointment with my doc. But I’m also scared because I eventually want children and not having my period for so long scares me bc that means I won’t be able to conceive one day. Any thoughts to calm my nerves? Thanks ladies.