TTC and 4 months postpartum

So my hubby and I just had our first baby feb 17 of this year, my daughter is almost 4 months old now and is perfectly healthy and when we tried for her we got pregnant on the first try! We are both young 24 & 25 and want our kids close so we are TTC #2 now. The reason Im posting is bc I've been having a lot of spotting here and there (light red blood) very little amounts not enough for a pad and sometimes (like today) even a week and a half after my period? Im tracking my bbt and CM and today starts my fertile window and I spotted again? Im wondering if anyone postpartum has had this happen to them? Im worried it's a bad thing but Im praying its just normal postpartum crap lol but Im hoping it won't affect us conceiving again? Just not sure... Any advice?