Help plz

So I’m 13 days late not sure wen I ovulated I did have ewcm for a few days but had sex around those days with the pull out method Ik it’s not 100% safe etc I’m almost 5 months pp and had one period in September which was my first since I had my son in June. I’ve been testing on the 88c tests from Walmart and have gotten very faint lines within the time frames but once there out of the allotted time frame they get very noticeable. Idn wut to do or expect.the top test is the one I just took with fmu n the drier one is just to show the line that I keep getting