Breastfeeding/no period/what the freaking heck

Abbigail
Okay ladies, ive googled and googled and i used this app to help me concieve my son and it was a heaven sent so here i am. We are not actively trying to get pregnant, my son is only 10 months. But we are very fertile, got pregnant in the first month of trying with him. I have not gotten a period since his birth due to breastfeeding and being on birth control. Well recently, i ran out of birth control but i was needing to take antibiotics for getting my wisdom teeth out anyway so we jist decided to wait the week to pick it up and be careful. Well we had two accidents, one when i was still on birth control but taking the antibiotics and the other i wasnt on it for a few days. I know, we are idiots. But i was like hey, there is no way. Well, ive been increasingly tired and basically feeling pregnant but its hard because last time my boobs hurt, but now they always do with breastfeeding a teething grabby 10 month old. I took 2 tests and they came back kinda negative. Negative but after about 10 minutes a faint line showed up, which i summed up to negative because it was over the time. Ive been crampy and bleh the last week or two. Well, i just had some light pink spotting just when i wiped so im freaking out cause it was just like the implantion bleeding i had with my son which i got around 3 1/2 weeks pregnant with him. Our first accident was about 3 weeks ago, last one was about 2 weeks ago. With my son i got a positive pretty early, before implantion bleeding actually, because he was a part of a set of twins but i lost one. I can track my period because i dont have one!!!! Ugh. My husband is in the military and wants to get out in december. We have had this plan and im about to finish schooling in may and our savings account is sufficient for the transition back to civilian life.. for one baby. Not two. HELP ME. Have any other mommas gotten pregnant while breastfeeding with no period?!?!