Sensitive topic

This may be TMI... but it’s been on my mind since I found out I was pregnant... I was sexually assaulted two days after having sex with my partner.. do you think my partner would be my children’s father since we had sex before I was assaulted? I haven’t told him because I’m scared that he will leave me and maybe not believe me..... Idk what to do.. we been trying for a year and its finally happening. It’s just unfortunate that, that happened to me & then I find out I’m preggers.... so idk what to do & I really hope my hope my daughter is his baby....