I have a girlfriend and I'm pregnant

Really Looking for answers. I'm not 100% that I'm pregnant . But I get tested tomorrow. Anyways I have been with her for 1 years and 10 months. This girl is the love of my life. We went through a break up because she was still talking to her ex after a year and 9 months.. I was broken. Ive caught her cheating with the same girl 5 times and another girl 1 time. We weren't together for about 2 weeks. But still lived in the same house.. I had sex with a guy after 4 years we did it raw cause I didn't care I was so hurt and broken. If I'm pregnant idk what I am going to do. We were talking about using a donor to get pregnant but it's no need to now... I love her and wanna be with her but I can't keep this secret and idk what my baby's dad wants..