How late do your test come up positive??

Yajaira
I'm 4 days late but still no positive pregnancy test.. I have one ovary and one tube.. I already have a 10 year old son, and I got pregnant with just the one set.. But I'm wondering since its been so long, how quick will I get pregnant again.. My husband and I haven't been trying long but I'm 31 and I don't want to wait much longer before having the second child.. Opinions/ Stories??