Very annoyed

Ty • Child of God | 25 | Wife | Ectopic July, 2017👼🏽 | Mommy to baby girl 10/18 💕💅🏽🎀 🤰🏽🌈 | miscarriage 9/19, EP 8/20

So, my husband and I found out we were expecting our first child on July 12th then our world came crashing down on the 28th when we found out it was ectopic. I had the methotrexate injection and at the time my levels were 1300+ then at my first appointment it was down to 800 the it jumped to 110 and my OB said based on that I was good to resume eating normally and adding veggies and Whole Foods back into my diet as well as my prenatals and I could begin having sex again.. along with TTC I was oblivious to the fact you could ovulate without actually having your period return.. I just didn't know anyways that was on the 21st of Aug fast forward to yesterday September 5 my mom advised me to just take a test.. and I did to ease her mind and it was positive.. so I took another and it was negative.. and this morning I took another to just appease myself and it was positive again so I called my OBs office to tell them the situation and the receptionist says "oh yeah I was going to call you today and let you know you needed to make an appointment to come in because your levels didn't go down on the 21st" Are you being sexually active.. I said yes be cause I have unprotected (because I didn't know there was even a slight chance of getting pregnant without a period) she goes "well you could be pregnant again but it still could be the 1st pregnancy if your levels are still low it's the first one if they are higher you could be pregnant again"

Now I'm confused and concerned because I don't want our child to have defects which is our fault for having unprotected sex and my fault for just simply not knowing you could conceive with no period. And if I am could it be ectopic again.. this is a nightmare.

1. Why would my OB give me the all clear?2. Thats pretty much 3 weeks ago why would you call me TODAY!?

I'm just so bummed.