Please don't judge honest opinions only

So my BF and i Broke up for a week or 2 and around the time I got pregnant I had sexual inter course with and ex it wasn't intentionally it didn't mean anything I jus got caught up in the moment , well I been tracking my ferility with glow and it says I was fertile between April 4th thru the 10th well I went to the dr i was 6 weeks pregnant my last cycles was March 16 so the dr added from there and it showed that I conceived March 30  she said that u ovulate 2weeks after your period and it stop on March the 30 she said I could have been fertile march 25 thru April 3 I had Sex with my BF a week before and the 30 thru the 2nd but glow said I wasn't fertile those days so I had a vaginal sonogram and my due date lined up with the last day of my cycle but I had sex with my ex the 4th-7th is there any way possible that my ex could be the father instead of myBF ? Honest opinion only no negative feedback please