plan b HELP

I took plan b on March 4, and I just started bleeding today (March 10, 6 days after). It’s lighter than my normal period, but still enough for a tampon, and it’s brown, which isn’t normal for my period. I don’t really know what spotting is, so I can’t tell if this is “spotting” or an early period caused by plan b. I also took plan b on February 18 and bled pretty lightly from Feb 24 to Feb 26. Also, the times I have taken the plan b he didn’t cum inside me, just the condom broke and I heard you can get pregnant from precum, so I got nervous. He said he was no where near finishing when the condoms broke. I’m not sure if precum is like an actual squirt of cum or if it’s just wetness at the tip of his dick, so I don’t know if him not being close to finishing is even a factor that matters. So I guess my questions are 1. Is the spotting/period normal after plan b? 2. Is there a chance i could be pregnant? and 3. What exactly is precum? Please no hate!! I know I sound dumb, but I’m just paranoid about pregnancy because I’m only 17 and have only been having sex for about a month. I know I should be on birth control but I’m getting it this week, and I have used a condom every single time I have had sex. We also decided not to have sex until I get on the pill.