Hello, thanks for using health care magic. Pregnancy results when sperms from a man meets with a waiting egg in the females body and that could only be possible if the man ejaculates in to the female s vagina. Following the information you have given, there was no penetration and defintely there should be no pregnancy. But if at all he did ejaculate with just the tip of his penis inside your vaginal ( not necessarily the whole length of the penis), then there are chances that you could be pregnant. That could be confirm through a pregnancy test using early morning urine and should after missing your period; i.e. about the end of may. It could be possible that the increase in breast are just normal changes due to the hormonal changes in your cycle. Hope this answers your query. Best regards Dr Achuo