Help what to do now ?

okay i was helping my friends mom get ready for a party a few weeks ago so she mowed her yard while i use the gas trimmer and but mulch and flowers out for her and we got do she was in her bikini i've always thought she was good looking she id 5'4 bout 165 tan good looking women. she is 39. we got done and she said come on in the house hun and we'll take a break an we did the she started cleaning and i helped her move the big stuff and we was cleaning in her room and she just tackled me on the bed and said you have done Alot and i gotta pay you back and she said i'm horny so ya ya know where that went for a while and then she was like don't tell any one i was like okay i won't we have being messing around with each other like 3 or 4 times a week now and the other day she called me and told me she pregnant so what do i do i don't want a kid i am 21 ugh lol