major anxiety about conception

so i spotted majority of may because i started nuvaring and had some random days of heavy bleeding

may 31st- i took out my nuvaring birth control

june 3rd: 5-10 minute drunk hookup without any ejaculation

june 4-7: scheduled period from stopping birth control.

june 9-currently: me and boyfriend got back together and had completely unprotected sex almost every single day

june 25, july 1 & july 2: had negative pregnancy tests

july 11 was nauseous and got 2 positive pregnancy tests

both my ultrasounds at 6 weeks & 12 weeks have been constant within a day of each other giving me a due date of march 13/14!! my doctor estimated conception at june 20/21 and said it was extremely unlikely that the random hookup could be the father and a paternity test was only necessary if i needed it to ease my mind.

(also since i had been on nuvaring and had bacterial vaginosis i didn’t know about that gave me very very thick creamy cervical mucus in the beginning of june so possibility of sperm swimming for long periods of time in it is lower)

i plan to get a paternity test eventually just to be 100% safe but in the mean time i need some advice or good thoughts sent my way!!!

also does anyone have a similar due date and know when they conceived?