new to forum....pregnant chihuahua

Hi! I'm critters...I have Peafowl, guineas, chickens, ducks, a cat, 2 poms and a chihuahua....

my chihuahua is pregnant but unsure of her 'mating' date....I was guessing @ April 25-26.
My boyfriend had let her out while I had not let her out without me and her on a leash. Had to
go out of town the following week to see my sister who had a stroke so hope he didn't let
her out again....I am only guessing he did not as he said he did not..?...
I am scheduled to go out of town tomorrow and over the weekend but thinking tomorrow
might be day 62-63 for her. How can I tell without going to a vet what stage she is actually
in? I felt a pup move for the first time on Tuesday I think...no leaks from her teats...checked
her temp this morning and it read 100.2 but last night it 99.4 ....

any ideas? Hate to leave her if I need to be here...