You can get pregnant from precum but not hours before your period. You have to be at a fertile time in your cycle.
You 110% CAN get pregnant from pre ***. That's why the pull out method does NOT work. In your case it is unlikely that you got pregnant from messing around and the baby is most likely your boyfriends. I would get a dna test after the baby is born to confirm he is the father but I wouldn't stress too much.
Hi there you can't get pregnant from precut and certainly not from fooling around, your doctor goes by the last day of your period so if they say uou are 6 weeks you are only actually 4, I worked out I was due the 19th July every time I have a scan the date moves forward, I am now due the 14th July, the baby is your boyfriends with out a doubt x