Please no rude comments. On the 27th I bleed very lightly and only for a few hours and it was fresh blood because at…

Please no rude comments. On the 27th I bleed very lightly and only for a few hours and it was fresh blood because at first it was bright red then it got to a light pink then disappeared. I bled maybe 9 hours total from start to finish. I know it wasn't from the few days before when my husband and I had sex unprotected because it wasn't brown or anything. I had my daughter on Feb 10th of this year (she will be 7 weeks on friday). How soon can I test to see if I'm pregnant again without it being a fake positive? My husband and I want our kids close together but we werent going to start trying till June which is a couple months before he deploys but we got carried away and I'm allergic to condoms (even sheepskin condoms) and I have really bad side effects from BC so that's why no protection was used. TIA