Need advise , please don’t judge me

Hi , I really need advice for my situation. My LMP was 11/5-11/8 . I was with my boyfriend of 4 years until a recent breakup however on 11/21 I had sex with another person ( pull out ) but I had sex with my ex boyfriend 11/15-11/17 and he finished in me. I’m now 5 weeks pregnant & totally stressed about this situation. I know it’s horrible & I feel bad I can barely get any sleep because now my ex boyfriend wants to get back together & be a family considering we were trying to conceive for 13 months previously. Any advice is greatly appreciated.