Help. Am i preg

Ladies I am so confused I am almost 5 months postpartum exclusively breastfeeding but actively trying to conceive we want our kids close together Friday I received a bfp and Saturday Sunday and yesterday and Monday I was getting very faint positives almost negative today with first morning urine I took another 88 Cent Walmart test and got another faint positive so how common is it because it's not getting darker and some days it's a lot lighter than usual even with first morning urine what are your thoughts