AnitaR: Irresponsible? well don't judge if you don't know the whole story.
SuzyQ15: Unfortunately you will not know if she is pregnant until about 4 more weeks. It is important that if you know the male and he is bigger then her, you will have to terminate the pregnancy
, she could die if you don't.
I'm sorry if you have don't have the means to take her to the vet, so better start thinking how to raise the money, or just go and spay her now that will be better (might be even cheaper and less complications) , no more worries in the future and if she's pregnant now, problem solved.