Alright ladies please help ease my nerves.

My daughter is almost 8 months, and a breastfed baby. I have had the joy of not having my period till earlier this month. Last week me and my husband were having sex, and he finished inside me without realizing. I'm on the pill, I take it like your supposed to. But yesterday and today I have been spotting, even though I just had my period 2 weeks ago.

Am I just paranoid or is it normal for your period to be irregular at first?