The context of the following conversation is Aubrey was apprehensive about going to the doctor. Aubrey finally went after some pressure.:
Aubrey says This spider bite won't stop swelling..
The friend responds It has grown a lot, you should go to the doctor..
Aubrey responds Nah, I'm sure I'll be fine..
The friend responds You could lose your arm if it was the wrong type of spider..
Aubrey responds Well, I guess you are right,  I had better get it checked out..
The friend responds Better be safe than sorry..